1. Download this file from one of the following links :

http://download.bleepingcomputer.com/sUBs/combofix.exe
http://www.techsupportforum.com/sectools/combofix.exe

2. Double click combofix.exe & follow the prompts.
3. When finished, it shall produce a log for you. Post that log in your next reply

Note:
Do not mouseclick combofix's window whilst it's running. That may cause it to stall