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Hi P_P......I also have Google Chrome, along with IE and Opera but none of them are set as my Default Browser: which is Firefox. Furthermore, like yourself, I have MSE to protect against viruses etc, and, personally, can't see that Malware is any better. In fact, I take the view that Microsoft should know how to keep its Windows clean.
Mc... I feel quite confident that I do not have any nooky nasties hiding in corners of my computer. However, I could be wrong but will be carefully watching the position to let the Ed know if anything else crops up (or as neti correctly says 'Pops-up')
Ron.