Luckily, I’ve never been hit with a virus so bad that it crashed my whole computer. I keep the virus software up to date and every now and then, I run a back-up program, just in case. However, I do have a back-up laptop if something should happen.
I’ve had some nasty viruses in the past, so I do keep a spare computer in the event something goes terribly wrong again. I need to get a better backup, though, because I’m not really happy with the extra one I have.