Windows 2000 And Sp4 Problem

[PCTech]

I just installed windows 2000 server.* I am hosting my domain on a static IP, I have DNS setup right i think?* When I am browsing on one computer I can login and remote control the server and I see that IIS has stopped (the service has stopped I click the play button it starts up again), but it keeps stopping!* I have tried everything I can think of to make it stop muckin up so much.* I have Exchange Server 2003 installed for my mail server.* Does anyone have ANY idea as to why IIS keeps stopping?* Its kinda hindering my webserver and mail server.* Also I get a 500 Internal Server Error when I access my exchange site?* why is that, I just installed it!* Also here is a list of installed programs

Activestate perl
Php 4.x (stable release)
mysql 3.23 (using it for the forum)
Exchange Server 2003

I have gone to windows update did all the updates, is there one I shouldn't have done?* Maybe I should just go to windows 2003?* Also when I ping i2techs.com I get the internal IP address of 192.168.***.***, DNS keeps updating it to that after I change it to the REAL IP address, how do I stop this so my domain will work?

Ideas or help is need,
~Sincerely PCTech

Edited IP for the security of our member

[PCTech]

Update:  Problem Fixed, something was conflicting with exchange server 2003.  I really wanted to use exchange server 2k3 because of the webaccess feature.  Any other good email servers that have the nice webaccess feature?  how about exchange server 2000?  does it have a way to do web access?  I know that lotus has that feature as that is what they use at the local college.  Any help is appreciated

Thanks,
~PCTech