Eddy
2
Avast needs only one reboot when installing. Constantly rebooting can mean several things
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Something went wrong during the installation. Remove Avast, reboot and try again. Make sure the installer isn’t corrupted. Download Avast again in another folder and compare the two installers.
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A application is interfering with Avast. Remove all applications from the startup list using msconfig or startup.cpl, reboot and try again.
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There is something wrong with your operating system (registry?). Try a in-place repair of the OS.
There may ofcourse be other reasons, but these come up in my mind.