Just to rule out PC Guard,
Turn it off and go on line to a safe site that you have been having problems with and see what happens.
Post back
dave
Try this: http://support.microsoft.com/kb/283807
Hope it helps. If it doesn't download Firefox install it and browse to a site your having trouble with in IE and see if you still have trouble. If you dont its an IE problem if you do it might be something else.
But preferably get a good browser