So I am trying to fix a friends Acer Aspire 5336 laptop - she brought it to me saying it wouldn't boot past the Acer flash screen - just a black screen with the flashing "_" . I pulled the drive and attached it as a usb external drive to my laptop - i could feel it whirring - but no recognition that an external drive was attached. Thinking perhaps the drive plates were stuck - I gently whacked the hard drive on the table - then swung it through the air a couple of times - then plugged it back in to the external drive port - and Voila! my laptop recognized the drive. I quickly made an image of the drive and saved it - because at this point I thought I was dealing with a failing drive. I had an extra drive - so I formatted the new drive and restored her drive image onto it. It still wouldn't boot, though, when I put it back in her laptop - so i reattached it as an external drive to my laptop, and started researching the issue, and then left it connected for the night. During the night, my laptop's AVG anti-virus and Microsoft Security Essentials ran - and one of them came back saying I had the TrojanOS/Alureon.H virus. At first I thought it was on MY laptop - but then I realized it was on her drive. Now I cannot run the TDSS killer or what not on her drive, because I cannot boot into it. I do not know how should I proceed? Any assistance would be hugely appreciated.