system
10
Since there are several of you with the same problem:
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Are you all using Avast Internet Security (AIS), and if so what version are you trying to install or use?
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Do you have a 3rd party firewall (FW) installed on the machine? If so, you need to uninstall it per the vendor’s instructions prior to installing AIS.
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Here is the download file for installing the current version for AIS: http://www.avast.com/en-us/download-software - click on the bottom, 3rd down is AIS
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Here is the Avast Uninstaller Tool: http://www.avast.com/uninstall-utility