computer slow, sites won't load, regsvr32 gobbling processor

[beccabrr]

A couple weeks ago (I think) my PC, running Windows Vista, started having problems after I switched to the Firefox browser (when Google chrome announced it would soon stop updating because VIsta wouldn't be supported).  After I stopped being able to print or attach documents to emails I switched back to Chrome, but problems have continued.  Sites open very slowly, and I frequently get a message that they're not available.  When I check processes, regsvr32.exe is taking up to 500,000k of memory.

 

Malwarebytes quarantined

 

 

Rootkit.Fileless.MTGen, HKU\S-1-5-21-2991280784-2447642418-4385585-1000\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN|^3c1a2be3, Quarantined, [dd9c5016eaaf03332e073d9cdb2808f8], 

 

on February 29.  I didn't delete it until today (oops, didn't read everything like I should have).  I have run MBAM several times since then and no new malware has been found.

 

Does this information give you any idea what is wrong or what I could try to restore functionality in my PC?

 

 

[LiquidTension]

Hello, 
 

Rootkit.Fileless.MTGen, HKU\S-1-5-21-2991280784-2447642418-4385585-1000\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN|^3c1a2be3, Quarantined, [dd9c5016eaaf03332e073d9cdb2808f8], 

This is a variant of Xswkit/Gootkit, and is known to download additional malware to the compromised computer. 
 

Does this information give you any idea what is wrong or what I could try to restore functionality in my PC?

Given additional malware is likely present, I suggest seeking assistance in the Malware Removal Help section. Please read the I'm infected - What do I do now? before posting.