Some sort of security malware - Help please!

Starting last night I have been plagued with some nasty malware. I am pretty sure I know what caused it, in the process of trying to get a video to work; I downloaded a codec for Windows Media Player. I know for a fact that it was bugged because AVG caught a trojan, but obviously something got through. So now here I am stuck with this spyware, I have spent the entire day trying to get rid of it because it is causing pop-ups which makes it impossible for me to use my computer.

I have noticed that in the taskbar everyonce in a while a yellow triangle with an exclamation mark in it will pop up saying I have some random malware and to click to fix it. It usually takes me to two sites: Pest control (or something like that, I know it is spyware because Spybot has found it but can't seem to delete it permanently) and some Anti-Vermin software.

Upon that, when I open Internet Explorer (I use Firefox) the homepage is on a specific site and I cannot get it to change the homepage, with this page is a pop-up saying I am, again, infected with some sort of malware. For reference, I have included the site: asafetynotice[dot]com

Now I have used HijackThis and I am almost positive I have found the culprit, however it will not delete. I have included a log from HijackThis, and the I believe the culprit is:

O2 - BHO: (no name) - {67982BB7-0F95-44C5-92DC-E3AF3DC19D6D} - C:\Program Files\Video Access ActiveX Object\isadd.dll

Also, when I open Task Manager, I notice that Winlogon.exe is running, I thought I remembered hearing about that being some sort of malware, so in digging deeper I have found that the following processes all seem to be some sort of malware or something:

winlogon.exe
isamini.exe
isamntr.exe
pmmnt.exe
pmsnrr.exe

I googled isamntr.exe and found that it TOO was also malware. It appears that this "codec" has brought my computer to my knees and I am desperately trying to find an answer besides formatting due to data loss.

I really hope this gives you insight into the problem and that you will be able to help me. I look forward to your response.