Do you mean rtl100.bpl?
Something is set to start up that uses that file. Only you know what is set to start with Windows so you'll need to do some clean-boot troubleshooting:
Clean boot in Windows XP - http://support.microsoft.com/kb/310353
Clean-boot advanced troubleshooting in Windows XP
http://support.microsoft.com/kb/316434
How to Troubleshoot By Using the Msconfig Utility in Windows XP
http://support.microsoft.com/?id=310560
or maybe this link could be of use it if applies to you
http://www.mycomputerstore.com/forums/showthread.php?t=205929

