Depending on what the virus has done to the system combofix goes in a uses alot of tools that computer experts use on a lot but normally one at a time. The problem is that it's like a nuclear option in that it tends to either fix the system, or you end up reinstalling the OS. It's a good tool but I view it as a last resort.
svchost.exe is a classic target of viruses because there are always tons on them running the in the process view of the task manager making it imposable for people like me to go in a manually kill it.
I would try a couple of the normal tools like some others have suggested in the thread, then move to malwarebytes anti-rootkit. Bleeping computers have a forum set up to help out with problems like this. They tend to advise using combofix last and will ask you to run logging tools to find out exactly what has changed on your system. Stuff like seek and destroy.
Your best bet is to save /backup important files, not an entire backup,, Than reinstall operating system. Only way to guarantee. Never use explorer firefox is safer
This is the safer tool mind you. Rootkits are nasty things, I really hope you don't have one on your system
When reinstall and all your basics Browser,,addons antivirus r up and running than go to search programs and type cmd u will have a black screen type netstat -ano
take a snapshot of it,, than compare to another one a few weeks down the road and see who's communicating with your computer. This is the only 100 percent way of telling whats really communicating. Very important that everybody does this.
I would run system restore first.
Just the thought of working on one of googles office units is scary. I sign there ticket and they have access to my entire search history that's cree.py