MAJOR Malware problem -- Unfixable outside of reformatting (it would seem.)

I would first off like to say that I really think you guys are doing a great job here, and I hope that you can help me with this issue I've had since late yesterday.

I was in the middle of a gaming session on Steam, and it suddenly crashed without warning. Curiously, I tried to start it up again only to receive an error: "Windows cannot the specified device, path or file. You may not have the appropriate permissions to access the item."

I found this odd because

1. I'm an Administrator, and the permissions on the file are full access open to "everyone"

2. Even after replacing Steam, the error occurred (not ending the process on startup, but in mid-game).

3. This problem soon extended to Malwarebytes, SuperAntiSpyware, Kepersky, Spyhunter4, MGtools and avast, the processes abruptly a minute into starting. Even a boot-time scan with avast wouldn't pick up on anything.

I tried everything on the Readme page to no avail, including reinstalling every listed anti-malware. The only thing that lasted more than a minute was Combofix, and it didn't even do anything for about an hour past the "scanning infected files" segment.

And, this morning, I learned that my archival programs (WinZip, WinRar, 7Zip) are now being blocked as well.

I really hope that I can get a fix soon. A few of my things are irreplaceable, and I simply hope that there might be some way to preserve those things, at the very least.

Thanks.

 

Thank you very much for the reply, but sadly, nothing has seemed to work. Whatever's doing this impossibly elusive.

Firstly, the EXE File fix was usuable, but I was greeted to an error:
"Cannot Import C:\Users\(Username)\Desktop\xp_exe_fix.reg: Not all data was successfully written to the registry. Some keys are open by the system or other processes"

I looked up this error in question and it suggested that I should try running it in safe mode, but I discovered that, even when pressing and holding F8, I could not enter the "advanced options" menu on startup and was unable to select any safe mode option.

My homepage was also replaced by "http://www.startnow.com/", which is also a bad sign, but I digress.

Rkill.exe came back with absolutely nothing of note within its scan, while AVPFind.bat either abruptly stopped; whether it was its own accord, or by the malware's, I can't tell, but it did leave a log, which I will attach in addition to that of Rkill and exehelper.

Speaking of the latter, I ran it and it seemed to change nothing; I still recieve the same error message whenever I attempt to start up a "blocked" program.

Combofix also refuses to work, for whatever that may be worth, even after a restart and fresh install/update.

So, is there anything else I could use, or should I start saying my farewells? Thanks for your help at any rate.

 

As before, SuperAntiSpyware ended out of the blue, but the portable version did pick up at least four instances of "Trojan.dropper/svchost-fake" before cutting off after three minutes.

And, the ESET ran a scan, and got rid of a few "Win32/Patched.HN trojan"s, but one persisted, for reasons unknown.

As a sidenote, I looked up the former bit of malware over Google and used OTS; just stating ahead of time that it did not work. I started up the utility and attempted to use the method here (http://www.help2go.com/forum/spyware-help/106163-trojan-dropper-svchost-fake-virus-malware.html) before, when I tried to run it, the process instantly ended as soon as I clicked "Run Scan".

(Edit Also ran GMER from said method, only to have it face the same fate as OTS after it gave an initial scan. Details are now attached.

 

Yeah, I noticed that it cautioned against it, and I realize it didn't do me very much good, but I'm just kind of desperate not to let my system.

Now, the tricky part about TDSSKiller is that it apparently cures most of these afflicted programs at a time, but usually a small percent have "processing errors". It might show up in the log.