User Accounts and priviliges denied

[jamesmag2325]

I've XP Pro on my system and I recently ran Spybot S&D to grt rid of spyware, etc;
and now my system is a bit messed up. It is now logging on as Guest and all my
administrative priviliges are gone -- or maybe hidden. I don't have access to System Restore; and when I log off it goes back to Guest. Luckily, I can still work around and access some of my files and folders.

But I can't do basic stuff as changing wallpaper, installing programs, or accessing
the Control Panel to fix user accounts. How do I get back administrative rights?
And, of course, I cannot access System Restore and a few of the default XP [tweaks], right now.

[jamesmag2325]

I'm clutching at straws, but one of the weird problem now, is that my computer keeps saying: Windows cannot find 'C\WINDOWS\system32\rundll32.exe'...

So, I can't even right-click on My Computer to [do] the necessary steps to change from Guest account to Administrator. What else can I do?

[Donald]

Hello
it might be a virus or a malware

try to check

http://www.techdo.com/showthread.php?t=907&page=1
http://www.techdo.com/showthread.php?p=1510&page=1