My computer is really messed up but it didn't come with any sort of disk…Its a Compaq. On the tower it says Compaq Presario SR1403WM. We bought it from a store. I think Best Buy or something but anyways it would be way out of warrenty by now. It has been years. I want to start it fresh (system restore wont cut it) and even if I did find a way to start fresh it didn't come with a windows XP disk to reinstall….My mom would have thrown the receipt away by now. HELP?

I found a trojan and some spyware on the registry of my PC. Would a reinstall restore the registry to when I first bought it? The thing is, I've done that, and the trojan and spyware still shows up in the registry keys when I do a scan.

I know most of these programs designed to clean your computer and getting it to run most efficiently allow a set number of computers to install the program at one time (if you bought it). Does this mean you can install it on multiple computers if you uninstall after scanning/removing in say a computer repair business? If antiviruses can only be installed a set number of times, how do businesses offer virus removal/etc services?

I recently had my computer system swiped clean, but I am on dial-up through msn, so when I insert my disk to download Msn it is saying no modem detected, What does this mean? I have it all hooked up right and my other computer is working fine with this phone line. Can someone help me out?