Please find below links to some softwares and other tricks to fix windows errors: 

    * Windows Event viewer - using this built-in tool, you can view the system event log and see error message that my not be displayed to the user. This can be incredibly useful in your detective work.

    * Microsoft Dependency Walker - great free tool that will allow you to gather a list of all DLLs used or required by a program or other DLL. This can be a life-saver.

    * Ad-Aware by LavaSoft

    * Spybot S&D

    * Windows XP Recovery Console - can be used to restore files from the XP installation dis.

    * Sysinternals Process Explorer

    * Windows XP 'emergency repair' procedure - when things get really dicey