That's usually the case (or at least it was) when you uninstall MyIE2, now Maxthon browser, and it was set as your default browser instead of IE.
Simple solution is this:
Open My Documents window on the desktop...
Go to TOOLS, then chose FOLDER OPTIONS. Now chose FILE TYPES tab. Inside the list find URL-HyperText Transfer Protocol and URL-HyperText Transfer Protocol with Privacy. Click (for both of them) on ADVANCED button and then when you are inside the EDIT FILE TYPE window, click OPEN in the left panel and then EDIT on the right side.
This is what needs to be inside the Application used to perform action box:
"C:\Program Files\Internet Explorer\iexplore.exe" -nohome
Cheers!
P.S. Btw, it has nothign to do with avast! in any way... ;) I know you didn't mean avast! is responsible, just mentioned that...
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