Ok.
It is possible you´ll have to do the below from safe mode
with network. However, try from normal mode first
Please download Combofix:
http://subs.geekstogo.com/ComboFix.exe
And save to the desktop. -<< Save it as
mike.exe
Close all other browser windows.
Please connect all your external hard drive/flash drive before running Combofix, if you have any
Double-click on the combofix icon found on your desktop.
Please note, that once you start combofix you should not click anywhere on the combofix window as it can cause the program to stall. In fact, when combofix is running, do not touch your computer at all and just take a break as it may take a while for it to complete.
When finished, it will produce a logfile located at
C:\combofix.txt.
Install Avira:
http://www.avira.com/en/download/
Attach the contents of
combofix.txt in your next reply, along with fresh hijackthis log