Sounds like "Use my Style Sheet" ......
Internet Options | General [tab] | Accessibility [button]
Any options selected there? Note: by default all 4 should be unchecked.
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Source: Mike Burgess http://www.mvps.org/winhelp2002/
May have been caused by a parasite using .css files.
Check it out.
Dealing with Unwanted Spyware, Parasites, Toolbars and Search Engines http://mvps.org/winhelp2002/unwanted.htm