If the System Restore still works(a lot of nasties can turn off windows utilities including system restore) then sometimes that is an option, if you go far back before the infection started, a clean restore point.
A lot of nasties these days, change pernissions so we can't really pinpoint what infection it is, until we see some logs.
Here's another link on System Restore if it helps:
System Restore FAQs.
http://www.5starsupport.co
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by: IndiGenusPosted on 2007-12-08 at 15:28:04ID: 20435495
As far as the infections go. The nastiest and most common ones I'm seeing out there right now are Vundo trojan, smitfraud, and other various backdoor trojans and bots. And yes, they are going right after permissions in the registry for access to things like Control Panel, regedit, Start->Run. This is for the pretty obvious reason that it makes it more difficult to fix things if you can't get to the "tools" you need.
e.com/Viru s_and_Spyw are/Anti-V irus/ Q_229 94719.html
indowsxp/u sing/helpa ndsupport/ getstarted /ballew_03 may19.mspx
A tool called SDFix will automatically restore permissions much of the time now (not always but most). It also removes many of the nasty bots and backdoors that are out there right now.
The next tool we are usually implementing is combofix nowadays. CF goes after several infections including Vundo and also offers very powerful scripting capabilities to do file/folder/driver deletion and reg edits all in one shot. Here is a good example including the use of these tools and Smitfraudfix.
http://www.experts-exchang
This was a pretty severely infection machine that without these tools and the knowledge to use them would have been very difficult to clean.
Here is a link to instructions on using System Restore.
http://www.microsoft.com/w
One point I want to make though since this is a malware discussion. Most times system restore won't solve malware issues. Could even make it worse as most of the time the restore points are infected too.