Xp problem - after idle star bar goes black and computer freezes

Everytime my computer idles for a while, the whole start bar goes completely black and I can nolonger do ctrl+esc or ctrl+alt+delete. Everything gets frozen. Does anyone know how to fix this? Thanks!

It could be caused by any number of things. Post your system specs in detail, including any SP installed... and the version of XP, whether it be Home or Pro. In addition, open Event Viewer (in order to access the error logs, and check for any critical errors)...Start | Run | Type eventvwr.msc and click OK | Highlight "Application" and "System" independently in the LH pane | Right click a couple of the newest crtical errors you've received (critical errors are in Red), and select "Properties" | Copy and paste (use the "Copy to Clipboard" button under the arrow butons in the Event Properties" window) a couple of the latest critical error messages as they appear under the "Description" field, and post them in this thread.

Also... open the System Information tool by typing msinfo32 in the Run box | Expand "Components" | Highlight "Problem Devices", and look for any problems that might be listed there.