Alright so my computer had a virus so I decided to reinstall windows. The virus was filling up my hard drive with I don't know what. Anyways reinstalled windows and it kept a folder titled old windows. I tried deleting it and it was taking forever there wasn't much in there so I looked in my properties and the file size appeared to be growing! I figured the virus didn't get wiped. I run two hard drives so I reformatted my second one and unplugged my main one. Installed windows on the secondary hard drive. Then I plugged my other hard drive in and reformatted it. Reinstalled windows on my main one and am currently running off of that. The old pc folder was empty on both of them so I don't think anything could have spread. Unfortunately now it won't let me reformat my second hard drive now. Any ideas? It just says windows was unable to complete format when I try.