Youll probably need to  format and reinstall xp again hope you have a disc.
its pretty straightforward
I have no idea of your level of experience but if youre really new right click on recycle bin right click again or something you should get an option to restore files try that.
The files you need to leave alone are the windows ones
anything there leave strictly alone>
       Regards Mark
                
 Mark
                
 August 2005