diagnostics

Hello, I was wondering if there are bootable flash thumb drives, would flash memory card be a good idea? I guess for main OS it won't due to constant writing of data but how about to use Live CD stuff on them like Windows, Linux for troubleshooting and repair purposes? I heard how not using...

I'm looking for a decent repair tool for computer work that I'm planning to do on the side. I need it to run diagnostics and virus removals. I'd also like it to have a few side tools for generic repairs. I've looked into: PC doctor (But it doesn't have virus removal from what I've seen). EasyRE...