It's time to remove the hard drive and put it in another computer or convert it to USB to recover any important data you may have. If you are backed up save yourself a lot of headaches and re-install the Operating system and check it out thoroughly for proper operation before reinstalling programs and transferring data. That will eliminate the malware possibility. If the hard drive is failing it will show itself at that time. You can mess with a computer like yours for a long time and waste a ton of time or find out quickly if there are any critical failures. Hard drives are very cheap these days. It doesn't take much to find out what's going on. If yours is going bad you might have difficulty recovering the data right away and that will point to hard drive failure. If a new OS on a new drive or known good drive works nicely than you have saved a lot of time. I used to like Windows 7 64 bit but 10 is light years ahead and can easily be made to operate just like 7 with a start menu program. Good luck!