On my netbook I had it for a month, and chose not to reformat it and deleted the bloatware. Well I was searching google for an automotive forum and clicked on a forum and somehow got infested with nasty trojans. The virus blocked my internet access, and every time I tried to run an virus scanner, it would say this program is a trojan. I kept getting pop ups from windows security saying I had 32 infections and had to register to remove them. I couldn't even open task manager to see what was running, it would say task manager is a trojan. I was able to do a system restore and that did no good. Eventually it told me I had no access to do anything on my computer. I decided now was as good of a time as any to reformat. Since it was a netbook, it only has USB so I had to use another computer with a disk drive and mount my Windows disk to a USB. I did that and reinstalled windows. Apparently, I also kept my old version of windows to. When I go into my C drive from my computer, I have a file for windows.old which I can access all my program files, pictures, documents etc. I ran a Malwarebytes scan on my computer and it found 7 trojans contained within the old windows. I recovered all my pictures and documents etc, so how do I just get rid of the old windows? It's taking up HDD space and likely has viruses. I'm not sure how I managed to get both of them installed.