small computer

Well hello everyone! I am new to this Daniweb, but I thought I try to get some good advise here. I went to college and got my computer science and network technology degrees a few years ago.

I have done contract jobs only since then. I would like to start my own PC service business. What are some good web sites to get diagnostic software and hardware tools?

Any ideas for a good start? Thanks if anyone can help.

i'm thinking about starting a small computer repair business since i do repair certain pc's for people but i was wondering is there good software that i might need in terms of re-installing windows in a computer with out having them buy windows if they lost the original computer recovery disk?????