try combofix

http://www.bleepingcomputer.com/combofix/how-to-use-combofix

this is a serious tool follow the directions exactly

close all browsers and exit out of any programs that might be...

O2 - BHO: QXK Olive - {5AB14FEE-E161-455B-9A60-91AE848F8FA0} - (no file)

this is Trojan-Downloader.Zlob.Media-Codec
download SmitFraudFix read the directions and run it then post a new...

what type of computer is it

for a dell you might want to try Ctrl and F11 when you restart the computer or just try F11 but you have to restart the computer and then press the keys

sounds like malware. you might want to start your computer in safe mode and scan for viruses and spyware

you should also try ComboFix

here is the link and instruction on how to use it

http://www.bleepingcomputer.com/combofix/how-to-use-combofix

O20 - Winlogon Notify: xcttgs - C:\WINDOWS\SYSTEM32\xcttgs.dll

found this one its a version of Haxdoor.
here is the link for the fix.

http://users.telenet.be/marcvn/tools/haxfix.exe

I've...

try spybot search and destroy
http://www.safer-networking.org/en/index.html

and adaware
http://www.lavasoft.com/

http://vundofix.atribune.org/

try here if you do have the vundo virus this should help

try spybot search and destroy, and clamwin
you could also try to do a system restore to the point before you think you got a virus. have you also tried to reboot your computer.