Hi bob3160,
W32/Swen.A is malware that can shut down a number of common windows tools and disables AV programs.
Another one is Klez (Klez.H).
But we have special fix tools and safe mode tools to cleanse these viruses.
Sure our qualified removal experts here on the forums,
like essexboy, oldman, jeffce know how to handle these infections.
Don't worry,
polonus