Computer Locks up on Startup

[Firon]

I have dell desktop, it is not working properly. Whenever i start my computer it boots and show login screen (windows xp screen) but after 15 to 20 minute it crashes. Sometimes it locks up when i restart it. I have tried to clean my computer but no fix... Does any one know why computer locks up on startup?

[Rawko]

It might be better if you can give some more info. Give us your hard drive/partition layout. You need to provide the exact error message when computer locks up at startup for better assistance. Do you possibly have a lot of lint and dust that has been pulled into the comptuer by the cpu fan?Have you run the drfragment program recently? Have you downloaded and installed all the Windows Updates and Microsoft updates?

[RoninBlade]

This issue can be caused by any of the following conditions :

• Your computer may be infected with a boot-sector virus such as the AntiCMOS.A virus.
• Your computer is running an anti-virus program.
• Your computer is using hard disk management software (such as Disk Manager, EZ-Drive, or DrivePro) for hard disk geometry translation. These tools provide support for large hard disks (more than 1024 cylinders) when your computer's Basic Input/Output System (BIOS) does not support large hard disks.
• Windows Setup was unable to copy the system files to the hard disk.
• Security software has disabled access to drive C.

[deoWo]

Computer lockups can be cause due to svchost.exe, it is windows services. The Svchost.exe file is located in the %SystemRoot%\System32 folder. At startup, Svchost.exe checks the services part of the registry to construct a list of services that it must load.First, remove any floppy from the machine. It's a common error - when you reboot, the computer will try to boot from it, not find an operating system and halt.

Check this thread to solve the issue of computer locks up on startup :
Booting Lock up during Startup
Winows Update in Vista Locks Up
Vista locks up or freezes
KB951748 causes computer to lock up during startup