Computer Woes- BAD Geek Squad

On Sunday, when we returned from vacation we spent most of the day getting the computer to run again, after buying Windows 7. Vista destroyed all the files in it for the 2nd time in 2 months, so we've had enough of that operating system to last me a lifetime. We brought the computer to Best Buy to have their Geek Squad wipe Vista off, and they gave it back to me with nothing done. They said they "did a diagnostic that costs $70 and found that the hard-drive on the 2 year old computer was fine." But didn't do what I asked them to do (wipe off Vista) so, when I got it home, the computer went haywire on me again. I somehow managed to get it to boot Windows 7 and override Vista. I will never use "Geek Squad" at Best Buy again. If you DO have a Vista operating system, BUY the Windows 7, and over-ride it. You won't regret it.