I installed AVG Anti Virus on a Dell XPS workstation running WIndows 7 Professional. Immediately after reboot, I get the dreaded "These files can't be opened. Your Internet security settings prevented one or more files from being opened". It applies to ALL .EXE files, including Microsoft Office, Explorer, IExplorer. However I can start a document that is associated with one of these EXE files by double-clicking it (e.g. an Excel sheet on my desktop opens fine).
I can run some bits of Control Panel but not all.
I uninstalled AVG and rebooted - made no difference. I can't do a system restore, I get the same error message.
Is there any alternative to a factory-settings reinstallation then all the tedium of reinstalling my apps? Would it be worth reinstalling WIndows 7 from the original DVD?