my computor will not let me start up error keeps showing up samlib.dll re installing application may fix the problem. i can't get onto the internet or my desk top to sort out the problem windows will not load any suggestions what i can do

Safe Mode
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Can you get into Safe Mode?


System Restore > Run from the Safe Mode option or:
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You might try a System Restore to a point prior to your problem:

start > All Programs > Accessories > System Tools > System Restore

can't get into safe mode

Boo the XP CD and enter the Recovery Console.

How to install and use the Recovery Console in Windows XP

Try the command: FIXBOOT