system
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Two anti-viruses will conflict with each other. I think leftovers from Kaspersky are conflicting with avast.
First boot into safe mode & uninstall avast. Boot into normal Windows. Next follow the instructions on using the Kaspersky removal utility. http://support.kaspersky.com/faq/?qid=208279463 Reboot.
To be sure to get a clean install of avast, run the avast uninstall utility. Reboot. Now reinstall a fresh copy of avast.
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