The worst is when you lose the C: drive. Then you have to reinstall everything! Takes forever! And when they reinstall Windows, after putting in a new hard drive, or SSD, all the drive letters are scrambled. I have several hard drives and two SSDs. And there are some programs I lost. for example, so cool utilities that I got via bitsdujour.com. Often you have to install within the promotion period. And there is some old software that won't even install, sometimes. But I really think this is just the power supply. So, with a new one installed, everything should be fine.
If I had the money, I'd get a new motherboard and CPU, at least 16G of RAM, a new high end nVidia card, to handle iray and dForce better. But right now, that's just dreaming.
Dana