Shuts down after loading screen.

When I try to start up the computer it shuts down before I see the log-in screen. It stays on the loading screen for about a minute then shuts off. I tested the hardware, and it checked out fine.

The files are not backed up. I do have both install disk. Everything was running fine, but the day it started I was online a window popped up saying that my application memory was full and required me to force quite programs that weren't being used. I deleted some files, shut her down, and have not been able to log-in to my desktop sense.

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