WebResource.axd 404 errors

Windows Server 2003
Microsoft-IIS/6.0
asp.net 2.0
PLESK 9.5.4

Hi
I have a website on an hosting service.
From fiew days i have a great problem. My log files report thousands of 404 errors for the webresource.axd file, but pages are correctly loaded. My hosting service says : parallels is working on the problem.
Well. Can i write something in web.config file to avoid this problem?
thx