Registry clean fix?

Today the computer infected the virus which is called the Registry clean fix . It can not delete by anti virus. Moreover I try to click system return. It means that computer back to before virus infected. Finally the computer has back to normal and fully function.

i know that having 2 anti-virus softwares can affect the computer but does 2 registry cleaning softwares affect a computer? oh, and which software is better – registry easy or tuneup utilities 2009?

I have a friend who’s computer is so riddled with viruses that you can’t even run anti-virus. Any suggestions on any freeware out there to help?

Also is there a version of linux i could put on that is user friendly?

A Registry Mechanic (installed on my Desktop) scan showed 24 shared DLL’s, 75 Temporary/Shortcut and 14 Deep Scan problems/errors. Unfortunately, I’m not a computer nerd and so, I don’t know what all that stuff means. I haven’t purchased it (Registry Mechanic/PC Tools), yet. I don’t know what a computer "registry" is.

I’m also receiving prompts telling me I have both application and stop (and some other type of error I don’t remember) errors.

My computer’s security programs consist of the following freeware: Ad-Aware SE Personal; Spybot Search & Destroy, and SpywareBlaster for malware/anti-spyware purposes; and for a firewall, ZoneAlarm.

I have an unpurchased/not registered Spy Sweeper (Webroot) on my Desktop which I use for scan purposes.

My only registered/purchased (anti-virus) program is AVG Professional, from Czechoslovakia, and I’m in the last year of their two-year program. I have no big complaints about them. If there’s a better one, I’m not aware of it

HELP

is formatting what the techs call f-discing.cuase if it is i can save money when i have it refurbished again or maybe you can tell me how to look for bad files that my anti-virus didnt catch and regcure didnt clean.