BleepingComputer.com: Search Engine Redirect Virus/ Can't Install AntiVirus

Hi, please help me! I have two major problems: One is that the Search Engine results keep getting redirected to other sites, and this also happens even when I type the URL directly into the address bar sometimes. Problem two is that firefox keeps crashing like crazy! And actually, there is a 3rd problem which is the worst problem of all. This is the fact that Spybot, Malware Bytes and AVG ALL stopped working and even when I uninstalled and reinstalled them over and over again, they still did not work! Please Help, thanks a bunch. :[

Can anyone please help me at all?

we need more info about your problem to help you out.
Can you tell us what you did before the infection and what processes are running.
Try Hijackthis and use the hijackthis forum to post the text results.
Then we can help you out more effectively.

I had AntiVirus System Pro, b.exe, and msa.exe infecting my system. I removed them all by deleting the registry keys and program files. After they were deleted, I was still getting my search engine results redirected to other sites and firefox started crashing regularly. Also, as mentioned, Malware Bytes and Spybot randomly stopped working.

The message I get is "Windows can not access the specific device, path, or file. You may not have the appropriate permissions to access the item."

Here are the processes running:

firefox.exe
flash.exe
driverrobot.exe
wuauclt.exe
aolsoftware.exe
wincinemamgr.exe
acrotray.exe
aim6.exe
ctfmon.exe
msmsgs.exe
jusched.exe
DrgtoDsc.exe
alg.exe
ViewpointService.exe
wdfmgr.exe
pen_tablet.exe
svchost.exe
nvsvc32.exe
MDM.exe
jqs.exe
avgwdsvc.exe
AdskScSrv.exe
svchost.exe
avgemc.exe
taskmgr.exe
spoolsv.exe
raysat_3dsmax9_32server.exe
svchost.exe
svchost.exe
svchost.exe
svchost.exe
avgrsx.exe
lsass.exe
services.exe
winlogon.exe
csrss.exe
smss.exe
Pen_Tablet.exe
Pen_TabletUser.exe
WISPTIS.exe
System
System Idle Process