Hi, welcome to TSF!
- Double click combo-fix.exe & follow the prompts.
- When finished, it shall produce a log for you. Post that log in your next reply along with a fresh HijackThis log.
- Do not mouseclick combofix's window whilst it's running. That may cause it to stall.
- Do not post the ComboFix-quarantined-files.txt - unless I ask you to.
- If your Antivirus software is detecting combofix or a part of it as a virus, please choose to ignore it as Antivirus products cannot determine the good/bad use of some softwares embedded in combofix.