I've been having a lot of trouble recently with a bunch of issues that make it hard to continue with using this laptop. Random hibernations have happened a lot, and I had a case where the host file was changed TWICE and a hardwired IP was in place of google.com, thereby redirecting my searches to things like "bonsearch" and other such dodgy material. It doesn't seem to have happened again. I only have a vague idea as to where this might have started, since I browse the same safe websites all the time and hardly ever download; recently, I allowed my laptop to be used by the whole family over the course of our holiday, and I did find pornographic material on the history after my brother's use. My mother tends to play bingo all day every day too, and used my laptop for that on the holiday. Other than that cause, there's one thing I downloaded that got flagged up by Security Essentials - "LazyNewbPack" for Dwarf Fortress (which I deleted a long while ago) has been shown to be a 'backdoor' virus allowing remote access to my computer.
That image shows the "LazyNewbPack" flag, but also the three other things that have been causing me some trouble: those three viruses, the "severe" ones, keep appearing on every single scan I do of the Win32 folder, and most quick-scans, when I scan daily. I'm not sure what they're doing (I'm far from tech-savvy...) but it's kind of frightening that they don't go away. I've already ran TDSSKiller as per another post I found on this site regarding "lazynewbpack", but that found nothing at all. Spybot S&D found nothing, either, but Security Essentials always finds those 3 severe ones when I scan enough.
For some reason, until I downloaded and scanned with Security Essentials, I was also unable to delete any history or cookies on Internet Explorer. Security Essentials found some "Exploit" type virus, so I guess that might have been the cause.
What could be causing these problems? Thank you for your time.