Cant debug ASP.NET with XP SP2

I upgraded my computer from Win 2k to Windows XP sp2 and since then i am not
able to run in debug mode from Visual Studio. I have checked all the things
suggested in 'Unable to start debugging on the webserver' help document. I
have not found any kb articles regarding my problem but only about sp2 and
remote debugging. However I have found solution that helps me start
debugging but requires me to logon to site every time. I have unchecked all
the authentication methods in the IIS except Integrated Windows. That allows
me to start the debugging but I have to logon with my own useraccount every
time. As soon as I check the Anonymous access I not able to start in debug
mode. Is there anyone that know a solution to my problem?