powering off issue

[Jarod888]

I just recently got my old computer up and running again after I moved. I am in the process of building a new one. Anyways I got a new Cordless keyboard from Thermaltake, the Xavier one.

I turned off my computer, and when I turned it off I noticed that It had 6 Security updates to install. So it finished installing the updates and turned itself off.
I unplugged my old keyboard and mouse, and plugged in the new receiver for the wireless one I got. I turned back on the computer and hit the synch buttons so the ky board and mouse would work.
I got logged in to windows and 30 seconds later the computer rebooted it self. I figured it might be something to do with the updates so i tried again.

Needless to say the computer reboots it self every 30 seconds now so far 35-40 times, but only after I log in. It wont reboot at the welcome screen with the password box. I am running XP corp Sp2. The powersupply was replaced about 7 months ago, it is a thermaltake 480 watt. it ran fine this morning, I had to do some updating of programs and such but now it wont stay on. Please help.