Can't make a new partition !!!!!

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Hello,

I'm running windows XP with SP2.

I want to install longhorn on my pc. I run Partition Magic 8, and all is ok since I reboot

Partition magic cannont find the "boot sequential" and I have to hit a key to continue I hit the reset and reboot, the same screen with Partition magic and hit the reset again....................After I hit the F8 and choose load the last known good configuration and all is ok, but I don't have my new partition <_<

Any help ?

Thanks