Do a HijackThis scan & place a check next to these items and select "Fix checked":
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
O3 - Toolbar: (no name) - {C1B4DEC2-2623-438e-9CA2-C9043AB28508} - (no file)
O4 - HKCU\..\Run: [explore] "C:\WINDOWS\EXPLORE.exe"
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1. Download this file -
http://download.bleepingcomputer.com...a/ComboFix.exe
* IMPORTANT !!! Place combofix.exe on your Desktop
2. Go to

→ Run →
paste in the single line command & click OK
"%userprofile%\desktop\combofix.exe" /killall
3. When finished, it shall produce a log for you. Post that log & a fresh HJT log in your next reply
Note:
Do not mouseclick combofix's window whilst it's running. That may cause it to stall
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