Slow browser, slow internet, random audio ads: virus?

How long are these scans taking? Is your computer freezing or does the scan just stop? The computer might be overheating. In you previous post MAM removed a Potentially Unwanted Modification (PUM). . Because of all the scan with various programs you have done make sure at the present time the only ones on your computer now are MSE and MAM. Remove all other anti programs before doing anything else. Remove all P2P and torrent programs. Then reboot.
Then run sfc /scannow again and see if it picks up anything. Let us know of any changes.

A full scan with WDO takes about an hour. It's not the scan that stops; the actual process of removing the threats does. The progress bar advances quickly at first, but slows down and completely stops about 3/4 through. I let it sit there for 30 minutes, but it wouldn't continue. Same thing happened with the second scan. The laptop itself didn't freeze.

I'll reboot and run sfc later.

Update: Removed all AV programs except for MSE and MalwareBytes and rebooted (I don't have any P2P/torrent programs afaik). Ran sfc /scannow in an elevated command prompt but no integrity violations were found.

Opera is still hanging/freezing, and Firefox still loads pages very slowly. Google is still redirecting me to weird sites (like cigarpuma.com) Haven't had any audio ads so far though.

Tienjt said:

It found 8 threats and removed them... kind of.

Do you remember what the name of the threats that Defender found?

Another tool that you can try is Norton power Eraser, this is an on-demand scanner like Malwarebytes:

http://security.symantec.com/nbrt/npe.aspx

Because Norton Power Eraser uses aggressive methods to detect threats, there is a risk that it can select some legitimate programs for removal. You should use this tool very carefully. If you accidently remove a legitimate program, you can run Norton Power Eraser to review past repair sessions and undo them.

Also, you may want to flush your DNS cache. See this thread, post #5 and follow the procedure Jacee has posted:

Detected DNS cache poisoning attack.

Sounds like the "whistler bootkit"

Please see this article Whistler Bootkit – a new powerful Windows bootkit - NoVirusThanks Blog
also
http://labs.bitdefender.com/2011/11/...der-the-radar/

The fun never ends Jacee.......too many bootkits/rootkits lately.

Found the link to BitDefender's tool which it says removes this virus.

Bootkit Removal Tool - BitDefender Forum

Your best/safest bet would be a clean install.

Clean Install Windows 7

I would also recommend a wipe and clean install.

You have two options. Have a look at this post:

Lost your Windows discs? How to get replacement media, legally

Or, you can do a factory restore, provided there is a recovery partition on your laptop. Most come with this, you'll have to Google how to do it on your particular PC.

A Factory restore will reset it to how you got it out of the box, meaning all your personal files will be gone. Back up your personal files on the media of your choice and scan them carefully before putting them on your clean PC, as you may re-introduce the virus if one of your files is infected.

You can submit files here, up to 32 MB, to be scanned by several AV engines:

https://www.virustotal.com/