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#11
How did this engineer reinstall your WIn7 - run Factory Recovery or Clean reinstall from the retail DVD?
You say he retrieved your Win7 key but the key must be replaced by Acer if it is not readable on the COA sticker.. Are you sure he didn't crack it with a bootleg activation? This can cause you trouble.
At this point I would find a Win7 installation DVD to clean reinstall, wiping your HD as a precaution against any corrupt, illegal or infectious code: SSD - HDD Optimize for Windows Reinstallation
Perfect Reinstall