No browsers work aside from IE x64, Chrome gives Error 137

UsernameIssues said:

~~~
Or just do this: Repair Install

^^^ it is time to consider this ^^^

Or a clean install:
Clean Install Windows 7

That tut tells you how to download W7 with SP1 if your DVD does not have that.

Thank you guys so much for the help! MBAM is running a *quick scan right now, just started a minute ago. I've ran SFC /SCANNOW at least 5 times in a row, and several times before that, restarting after each time and it finds nothing. I will do a repair install when I can; I've downloaded the necessary .ISO file and I'll put it on a flash drive when I have the chance (I have DVDs, but my disk drive is DVD-ROM).

Edit: the scan finished and found a couple registry things:

Malwarebytes Anti-Malware (Trial) 1.61.0.1400
www.malwarebytes.org
Database version: v2012.07.09.08
Windows 7 Service Pack 1 x64 NTFS
Internet Explorer 9.0.8112.16421
Cameron :: CAMERON_X64 [administrator]
Protection: Enabled
7/14/2012 2:36:03 PM
mbam-log-2012-07-14 (14-36-03).txt
Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 239416
Time elapsed: 4 minute(s), 56 second(s)
Memory Processes Detected: 0
(No malicious items detected)
Memory Modules Detected: 0
(No malicious items detected)
Registry Keys Detected: 0
(No malicious items detected)
Registry Values Detected: 2
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run|HKCU (Backdoor.HMCPol.Gen) -> Data: C:\Users\Cameron\AppData\Roaming\install\explorer.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run|HKLM (Backdoor.HMCPol.Gen) -> Data: C:\Users\Cameron\AppData\Roaming\install\explorer.exe -> Quarantined and deleted successfully.
Registry Data Items Detected: 0
(No malicious items detected)
Folders Detected: 0
(No malicious items detected)
Files Detected: 0
(No malicious items detected)
(end)