Can you tell us how did you setup Sitefinity on your Windows XP machine? Did you use the Project Manager
or IIS? Setting up Sitefinity on IIS under XP is not possible, as in XP you can only have IIS 5.1, and Sitefinity needs IIS 6+.
Also can you consult the following page:
and make sure you fulfill all requirements. The following setup page from our documentation can help you setup your project correctly using the Project Manager
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items