Help Needed-how To Create A Bootable Antivirus Cd

[sunchaser]

I need to scan weekly some computers and there is no posibility of installing an antivirus software on the HDD.

The only solution i see here is to build a bootable CD containing an antivirus software (doesn't matter if is norton or other). Of course, i need to burn weekly a new image containing latest antivirus definitions.

Anyone can provide help regarding the building of this CD ?

Thanks a lot !!!

Sunchaser

[Thankbot]

1 User already said Thank You!

sunchaser

[JacKDynne]

This may help

Quote:

Create a custom bootable CD-ROM

Create your own custom-made bootable CD-ROM with virus recovery and back-up restoration options with Frank Charlton

So far in the Windows Hidden Secrets series, we've covered aspects of the operating system itself, from working with security policies to slimming down your Windows directory. This month we're taking a different approach, since we've covering the subject of bootable CD-ROMs - what they are, how to create them and why they can save your life in the event of a virus attack.

PC architecture has changed a lot over the last couple of years. Previously, you could boot your PC from either the internal hard drive or a bootable floppy disk - and that was it. The changes to the PC's BIOS - the small program held on a chip on your motherboard that kickstarts the PC and loads the operating system - mean that your PC can now boot directly from an IDE CD-ROM drive. If you have a full installation of Windows 98, you have a bootable CD in your possession already.

You can boot directly from this CD, and you're given the option of continuing the boot process from CD - which runs the Windows 98 installation program - or booting directly from your hard drive if an operating system is present.

Created Equal?
Not all CD volumes are created using the same methods though, and you can't just boot from any old disc. Normal CD-ROMs are created using the ISO9660 file system, and are readable on any PC running MS-DOS, Windows or Linux. Bootable CD volumes use a standard known as El Torito, created by Phoenix Technologies. This standard has been rapidly adopted over the last couple of years, despite sounding like a famous brand of tortilla chips, and all modern motherboards support booting your PC from El Torito CD-ROMs.

There are numerous reasons why it's worth the bother of creating a bootable CD for yourself. First, there's the problem of viruses. Many viruses can stop Windows dead before it's even loaded. Nasty pieces of work such as Win32.MTX can cause absolute havoc by bringing your Windows installation to a grinding halt, making it hard to get going again without a complete partition wipe and re-installation of Windows. Some anti-virus suites can run directly from MS-DOS without Windows being loaded, making them a useful recovery tool. With a custom-made bootable CD that loads MS-DOS directly from a CD-R, you can run a virus checker, such as Norton AntiVirus 2001, directly from DOS, disinfecting your Windows installation with very little hassle.

All very well if you're foresighted enough to create the virus-killing bootable CD before disaster strikes, but what about when you find you have no other choice but to re-install Windows? Once that arduous task is done, you can future-proof yourself to make it very easy to recover from a similar situation again. Once you've installed Windows and you have it set up the way you want it along with all of the device drivers installed for your hardware, you can use an imaging tool such as Symantec's Norton Ghost or PowerQuest's DriveImage to create an image of your hard drive to restore your system in the event of disaster.

We've discussed disk images in PC Answers many times before now. Basically, an image is a compressed file containing every bit of information on your hard drive - files, folders and all data needed to recreate the hard-disk partition exactly as it was when you created the image. With a few mouse clicks, you can restore a crippled PC back to your own custom equivalent of the default factory settings offered by major PC manufacturers.


What Do I Need?
The most obvious requirement here is that you need to own a CD-Recordable drive. It doesn't matter whether it's a SCSI or an IDE drive, and it makes no difference if it's an older drive that doesn't support CD-RWs either, since you'll be using a CD-R to create your bootable volume.

You'll also need some CD-mastering software that's capable of creating bootable discs that conform to the El Torito specifications. For the purposes of this month's Hidden Secrets we're using Ahead's Nero Burning ROM 5 since it both makes the creation process easy and comes available in a free 30-day evaluation that you can download and use to create your one-off bootable CD-ROM. You can download the demo version of Nero from www.ahead.de. If you already have some mastering software that came with your drive, then you may be able to use it to follow this tutorial. Other than Nero, the most popular bundled software with new CD-R drives is Roxio's nifty Easy CD Creator, which can also create El Torito volumes, though you'll have to check the manual for information on how to do this.

Finally, you'll need a blank CD-R or two. You should only need the one, but make sure you have a couple of spares handy in case of mistakes on your part or because of errors such as buffer underruns. You'll also need a blank floppy disk - more on why you need this later.

Altered Images
As we said earlier, bootable CD-ROM volumes differ from normal data CDs in that they use a specialised file system that's created for the purpose. The area of the CD that actually handles the boot process needs to contain what's known as a boot image. Put simply, your bootable CD-ROM requires the image of another existing bootable volume to work. What happens is that the BIOS temporarily assigns your CD-ROM drive the drive letter A, and re-allocates your floppy drive to B. The PC boots up as normal from the boot image placed on your bootable CD as if it were a real floppy drive.

The easiest way to capture a boot image is from a floppy disk you know already boots your system, such as a Windows start-up disk - run Add/Remove Programs from the Control Panel, iclick on Startup Disk tab and then the Create Disk button, making sure a floppy is in the drive.

If you plan to use Norton Ghost to archive your existing system state to CD for later retrieval, it's worth noting that you can also use the Ghost Boot Wizard to create a boot floppy with CD-ROM support, which will do much the same job, and saves your having to copy the Ghosted files to your CD-ROM later on. And if your PC has SCSI drives, you'll also need to make sure you copy the correct DOS drivers for your SCSI card to the boot floppy before you proceed, or your bootable CD won't be able to access any SCSI drives on your system.

Creating a custom bootable CD with Nero

1 - Insert your start-up disk into your floppy drive and launch Nero. When the New Compilation Wizard opens, scroll down and select the icon labelled CD-ROM (Boot). Switch to the Boot tab and ensure that the source of the image data is set to drive A.

2 - Switch to the ISO tab. To make sure the disc is perfectly readable under MS-DOS,set the buttons to ISO Level 1, ISO 9660 character set and clear the two boxes in the Relax ISO Restrictions section.

3 - Switch to the Label tab and make sure the drop-down menu at the top is set to ISO9660 and not Joliet. Give your CD meaningful name such as 'BOOT' or something similar.Click the New button to close the Wizard and open Nero itself.

4 - Use the File Browser window to navigate to directories containing any program files you want to copy to the CD, such as your copy of Norton AntiVirus or Ghost. Drag the directories and drop them on top of the CD icon in the left-hand window to add them to the CD.

5 - Click the Write icon on the Nero toolbar, or select Write CD from the File menu to open this dialog. Switch off Determine maximum speed and Simulation, then click the Write button to begin.
6 - Once it's finished,restart your PC with the CD in your drive and your custom boot CD will load, leaving you at the DOS prompt. To test Norton AntiVirus, change to the directory on CD and type NAVDX to see full list of commands.NAVDX /A will scan all drives except floppies, for example.
Frank Charlton

Hope that helps some And big props to the author

/JD

[Dijital]

I would also look into Bart's PE and building a bootable PE CD/DVD and adding Norton 2004 as a plugin into your CD/DVD

More info at: http://www.nu2.nu

[sunchaser]

Thanks a lot ! That's a god "how to" !!!

[Dave]

If you make that norton disk you need to do it on a 9.x system because you don't get the DOS executables installing it into xp\2000.
I imagine you would also need the current definitions.
Program Files\Common Files\Symantec Shared\VirusDefs
Dave

[sunchaser]

Thanks Dave !

Yes - of course i want the latest virus definitions.