when i attempt to switch usernames while on another name i get fatal system error c0000021a its a blue screen taht comes up with a message the the computers shut down..... any way to fix it

Click 21a at the left side of the following page. KNOWLEDGE BASE LINKS STOP MESSAGES

thanks for the comment but i think my message is a bit different then that one... c000021a fatal system error The session manager system process termined unexpectly with the status of0xc000000005(0x77e7569e0x002ef808)

Try System File Checker: Open the Command Prompt, then type: sfc /scannow note space between the c and / Have XP CD in your drive. Information about SFC

i lost my xp disk and i also tried to download the service pack 2 it didnt work any other ideas

This has a link on how to order SP2 on CD: How to Obtain the Latest Windows XP Service Pack ------------------ As for your problem: Go here and check to see if all your XP Services are properly set: Information about XP Services I like the black web page background. Easy on the eyes. -------------------- Also try this for your problem: How to Perform a Clean Boot in Windows XP To help troubleshoot error messages or other issues when you cannot determine the cause of the issue, disable common startup programs, settings, and drivers to eliminate possible software conflicts when you start Microsoft Windows XP. This procedure is known as "clean booting." (Can be done by way of Windows Safe-Mode, if normal Windows does not work, A Description of the Safe Mode Boot Options in Windows XP logon as Administrator, but where it says RESTART, restart into normal Windows.) How to perform advanced clean-boot troubleshooting in Windows XP and that one is a heavy duty article. Print the articles for reference.

Also do you check check for Spyware ??? Spyware info.from Microsoft Maybe check for, and remove SpyWare. Here you will find links for detection and removal software. Here is another that is at most computer stores, including Office Depot, Office Max: Spyware X-terminator Also, be sure to update any software online after installation, and every 1-2 weeks. Computer viruses: description, prevention, and recovery