I've been having troubles for a month or two now and decided to finally take my woes to the internet in the hopes someone could help me, before I consider giving up and buying a new laptop. I had troubles first running Windows 7 Home x64, now I'm running Windows 7 Ultimate 32 bit. I have a Sony VAIO laptop, 500 GB hard drive. I first had problems after running a Malwarebytes scan - I ran it overnight and when I woke up my screen was black and said "Operating system not found" or something to that effect. From then on, my computer would only boot about once in every 4 times I tried. I ran startup repair many times, and when I did get in things ran very slowly and inevitably I would get an abrupt BSOD. This persisted for a month or so. Some days it worked great, but always went back to the usual. A few days ago I bought a hard drive enclosure, got all the files off my hard drive, and totally formatted my hard drive. Then, after some difficulties in the installation, I installed Windows 7 Ultimate, 32 bit, because a family member had the disc for it. The computer worked a lot better at first but now again it's running slowly and I'm starting to get the BSOD! Sometimes I can use it 5 minutes before I get the BSOD, sometimes I have 2 hours. It's been hard to write this because it keeps BSODing while I was typing. I set it to not restart when it crashes, so I could write down the error messages I got on the BSOD. The second to last series of numbers is the only thing that changes BSOD-to-BSOD. Here are the codes (I skipped the middle part, which is text and all the same) for the last 4: How can I end this cycle of blue screens? Can anyone help? I'm going away on a trip tomorrow and will need my laptop to work. Thanks!