Manually deleting all corrupt files that SpyHunter found

You most definitely should remove SpyHunter.

http://www.mahalo.com/how-to-uninstall-spyhunter-and-is-it-malware/

-steve

Stephen has given good advice but if you want an anti malware program that works and is free try Malwarebytes anti malware from malwarebytes.org, it will find stuff anti virus may miss. To get rid of cookies and a whole lot more try CCleaner. Both small downloads both free but you can buy if you want, watch out for toolbars and free trials of full version as you install.

The next step is to remove SpyHunter.

This is an older review, but from a source I trust: http://www.brighthub.com/computing/smb-security/articles/76756.aspx

Unless they have fixed it, it has one other major flaw -- it can't be removed easily: http://www.ehow.com/how\_5252068\_delete-spy-hunter.html

This may also interest you: http://www.mahalo.com/how-to-uninstall-spyhunter-and-is-it-malware/

Your PC is clearly at risk and now infected, but you didn't tell us what. Your earlier post, http://answers.microsoft.com/en-us/windows/forum/windows_vista-hardware/drivers-are-old/047236d8-9147-4bf8-81f6-03ecea3b3483, indicated that you received a fake warning at one site at least.

I'm going to assume, since you mentioned FBI, that your PC is infected with the FBI Warning/Reveton malware.

http://www.selectrealsecurity.com/remove-ransomware

or see: http://www.bleepingcomputer.com/virus-removal/remove-police-central-e-crime-unit-reveton-ransomware

and a newer variant:

http://www.bleepingcomputer.com/virus-removal/remove-fbi-cybercrime-division-ransomware

From a fellow forum user, RickCP:

Related information from MMPC > http://www.microsoft.com/security/portal/threat/encyclopedia/Entry.aspx?Name=Trojan%3aWin32%2fReveton

And removal instructions - courtesy of bleepingcomputer.com >

• Remove the FBI MonkeyPak Ransomware or the Reveton Trojan
• Remove the Win32/Reveton or Police Central e-crime Unit Ransomware
• FBI Cybercrime Division Ransomware Removal Guide

I don't care for McAfee, but you paid for it, so keep it until it runs out, but in addition to McAfee, the following recommendations will assist in protecting the PC from infection:

-Make sure that the Windows Firewall is enabled.

-Make sure that all important/critical updates, including service packs for the operating system and programs are installed from Microsoft Update (Windows Update).

-Make sure Internet Explorer is at the latest version for your operating system and updated with all patches.

-In Internet Explorer 89, or 10, use the SmartScreen Filter.

-Make sure that IE Internet Security settings are at least set to medium-high (default).

-Enable the pop-up blocker in IE.

-On Vista and Windows 7 make sure that User Account Control (UAC) ON  and not running with elevated privileges.

-Make sure that Windows Automatic Updates are set to at least notify, but the preferred setting is to download and install automatically. If you update manually, be sure to update as soon as possible after being notified of available updates.

-Make sure that installed applications, especially Adobe Acrobat, Adobe Flash, and Java are at their latest versions. Many vendors are regularly updating and patching for security holes.

See: https://blogs.technet.com/b/security/archive/2012/07/19/the-rise-of-the-black-hole-exploit-kit-the-importance-of-keeping-all-software-up-to-date.aspx?Redirected=true

-Never click through links from unknown sources and use caution even if they are from a "trusted" source.

-Never open unsolicited email attachments.

-Practice safe web browsing.

-steve

Just remember that the free version of MalwareBytes only does scans on a schedule or when you invoke it. It does not act as a live real-time virus-protector (the paid version does that), but it is an essential backup to your full-time virus protector. The same is true for utilities like CCleaner and the similar Glary utility suite.  They are best for registry cleaning and freeing up wasted disk space.

First, don't use McAfee - It isn't nearly as good as it was 10 years ago.  Virus real-time protectors and scanners vary every year. Many can be used for free, or an enhanced version for a relatively small payment (I've rarely found the need for the paid versions and I have at least 6 to 8 computers attached to the web at any one time, running different virus protectors. 

For 2013, you should at least consider Bitdefender AntiVirus Plus, Webroot SecureAnywhere, Kaspersky (it seems to be making a real comeback), Norton (also much improved), Try MS Security Essentials, though I think it has slipped in rating from a couple of years ago (it's free, at least).  The BEST free one that competes on even footing with the best commercial ones is AVG free Anti-Virus.  A lot of people swear by AVAST and Trend Micro, but I haven't seen anyone, even PC Mag, do a bench test on their 2013 versions.  Make sure that you are getting a 2013 version no matter what you decide on.

For malware scans and removal, MalwareBytes is top of the heap.  They also have a standalone product for rootkit hunting, and an add-on called Chameleon, which can launch MBAM even where the virus or other malware is explicitly coded to block MBAM.  RKill is also a nice utility.  Run it first and it will temporarily disable any running malware, giving the other tools a much easier task of removing it.

I'll spare you the esoterica of rootkit detection and removal except to say that Avast's aswMBR is very good as is GMER (which downloads itself with a randomly generated .exe name to fake out rootkits looking for GMER).  Kaspersky's TDSKKiller is not as good

• but easier to use.

Second, go to www.revouninstaller.com and download Revo Uninstaller.  This essential treasure first runs the uninstall that Control Panel would normally run, but adds two priceless features.  It's next step is to go through the entire registry and find ALL of the orphan entries left behind by the standard uninstall (I've seen 0 to hundreds of registry entries not cleared out). You can easily remove them. The final step goes through the entire file directory structure and lists all of the apps, dlls, and whatnot left behind by the standard uninistall.  I've seen some products leave upwards of 200 little pieces - including reloaders, in the case of naughty programs - scattered around the file system.  You can permanently delete them with one click.  It is very rare that I run Revo to uninstall an application and find the standard Control Panel uninstall found and removed everything.