I have had 360 on 3 computers for about 5 years. Guess I am lucky as only one that has had any problems is the one I use at least 90% of the time.
Dell 1750 Laptop and i am sure the problems come from the fact this computer had Visa on it for two weeks (when new) and then Win dows 7 followed by Windows 8 and 8.1. However OS seems to work fine. Just that for last 5 years as new versions of 360 come out I let the download system continue to just update and NEVER have did clean install. Why, because I am afraid of losing my password(s) under ID safe. I know there is a way to PRINT them of which I would not mind retyping them back in one by one.
I am only concerned as this one computer is the only one that I ever have a problem. Many times it will not do system scans so I wait a few days and it will.
Maybe someone could post idea of how to save the ID's on this m/c (even to paper). I am not so great on saving to flash drives and reinstall. . Overall 360 has been excellent for me but know new version is coming and want to do clean install.