Removing trojan virus

Can I download a program from one computer and install into another pc? How and/or is it easier to download a free spyware or malware removal??? help!!!!

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Okay, here’s everything: Spyware Guard 2008 has been on my computer for about a week. I’ve tried getting rid of it. Obviously, I’ve been unsuccessful. The only way it’s affected my computer (that I know of) is that it moves slower, and that I’m redirected to a new site every time I use a search engine. Oh, and almost every time I’ve tried to go to a site for anti-spyware or anti-malware software, the page won’t display.

From what I’ve seen, the two programs recommended the most are SUPERAntiSpyware and Malwarebytes. I’ve downloaded Malware bytes, installed it, but it won’t open. I’ve tried opening it in Safe Mode, but when I do, my computer freezes when I go to log in. Spyware Guard 2008 has pretty much disabled me from downloading SuperAntiSpyware – it’s just not happening.

So now, I’m not looking for something free, I’ll pay if I have to. First, is there anything that I could go out and buy from the stores to fix the problem? Because that it what I’d like to do right now. Or is the software that can fix this only available through online download? I mean, am I gonna HAVE to go through the hassle of downloading the programs onto another computer, and getting them onto mine with a memory stick?

If you can help, thanks
My computer is a Windows XP, if that matters at all.

i really need to find a Trojan and spy-ware removal system does any one have any advice of one that will remove them for free

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it says : Restriction: This operation has been cancelled due to restrictions in effect on this computer, Please contact your system administrator.

Yes I am the only one who uses this computer and go on the same web sites since I got the computer. Control panel has been missing for about 3 days and I can’t click onto internet properties either.

Another popup also says: Warning! Potential Spyware Operation!

Your computer is making unauthorized copies of your system and Internet files. Run full scan now to pervent any unathorised access to your files! Click yes to download spyware remover…

I have already tried rebooting in safe mode, Spyware removal{{anti spyware} ,Antivirus. I tried to add Norton Antivirus 2007 but I have to remove my old version and can’t because I can’t add/remove software. Is there a way to make my computer like new without losing the factory installed software?

Any help will be greatly appreciated.
I tried the system restore , It only allowed me to go back a few days. That didn’t work either.

HP Pavilion computer