Ok We need some more info on your system.
Do you have Service Pack 2 installed?
Here is the Microsoft KB Article for this http://support.microsoft.com/?kbid=835732
iIn the article it takes you to the following:http://support.microsoft.com/kb/840997/
RESOLUTION = From the KB Article I just quoted it.
Windows XP service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
) How to obtain the latest Windows XP service pack
Please read the above articles from Microsoft it will help you make a decision.