Error accesing RS

I change the windows authentication from the default site folder security and before I change again to windows authentication. But now when I want to open reportmanager It raises Unable to generate a temporaty class (result=1) . error CS2001: Source file 'C:\WINDOWS\TEMP\ugmf4j6-0.cs' could not be found error CS2008: No inputs specified.

Any ideas?
RS Services April CTP.
Thanks in advanceI need to solve this quickly!!! I have a presentation with a director.

I thinking in reinstall IIS.

What can I do?|||I found no solution to this. I finally reinstalled IIS.