BleepingComputer.com: Computer freezing constantly - virus, maleware or OS?

Recently I was working on SPSS (a stats database) modifying one file over several weeks and saving changes several times per day. One morning I tried to bring my computer out of hibernation mode, as usual, but it said there was a problem and I would need to delete the restoration file inc order to resume. Since I had saved my data so often, I agreed. When my computer restarted the file was reverted back 2 weeks. I have since learned that SPSS files don't create temporary files, but still I was saving continuously so this was very strange. No other files were impacted (none were open either though). Since this time my computer freezes several times each day - every time I leave it sit. It's like it cannot come out of 'hibernation mode'. At the time of my problem, I went to run my Sophos virus software but it wouldn't start?? I then installed Microsoft's free virus program and following that avast! antivirus (based on someone's recommendation). I have run Malewarebytes too and only a couple small (apparently insignificant files, as per another IT forum user) were detected. Another issue is that my taskbar freezes too when my computer freezes. Bottomline I have two questions: (1) should I just reinstall my OS to fix these problems? and (2) I bought a new computer (as I CANNOT lose anymore of my PhD work!) and I am scared to move over my necessary files, as I worry there is an undetected virus that could affect my new computer. How can I be sure this doesn't happen?