I am no longer able to access the Site Style information for site styles I am using. The error message shown is below:

"Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button or try again later.

System error - 214667211"

I have not checked the site styles for a while so do not know when this problem started. I can see the 'text' part of the site style but not the graphics bit where buttons, background colours, etc are displayed. I cannot see these for any site style.

I am using AVG Free Edition 2011. Previously I used McAffee. I have not had any problems with files being quaranteed or removed when scans have been made with either Anti-Virus software. All the site style files are on my computer and have not been removed or deleted.