New Desktop Wallpaper? Saying my computer is infected with viruses??

My desktop is blue saying my computer may be infected with viruses. A new icon has appeared named PSGuard.

I scanned with NOD32 and it says my laptop is clean?

Does anyone know what it is? And what will it do?

New Desktop Wallpaper? Saying my computer is infected with viruses??nortan antivirus

PSGuard is a malicious anti-spyware software that performs those actions usually done by trojan horses. It uses a root-kit to keep registry key HKEY_LOCAL_MACHINE\SOFTWARE\ShudderLTD (with its child keys and values) protected. PSGuard is able to do this by using a well known exploit [difference between Win32 and Native APIs]. Having this nasty corrupt anti-spyware program on your computer makes it insecure, you should deal with it as soon as possible.

This Trojan is also known as:

ps guard

Scan your PC with these to remove it.

Spybot - Search %26 Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you haven't intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging. Spybot-S%26D is free.