Virus That Keeps Coming Back!

I'm not sure whether it's a virus, trojan, spyware etc but I have something running on processes which takes up around 180k memory. Everytime I close the process it re-appears but as a different name... For example, as of now the process is called 'xsggsz.exe' but now I've closed it and it's re-appeared as 'vzdfme.exe'

I've used spysweeper, McAfee, Ad-Aware and system mechanic to try and get rid of it but it just won't budge.

I'd appreciate any help regarding this.

Thanks!

 

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also if you do not have a firewall - you really need one.
I've used the free version of zonealarm for a number of years, and never had a problem, except a couple of times when I turned it off to access a site (that was real dumb)