well, I hate to say it, but it could POSSIBLY be some kind of virus, they're often disguised to look like something that's relatively standard in any windows tskmngr...try going here : http://www.answersthatwork.com/ they have a pretty good "task list", and it sometimes has an explanation what more than one instance of a proccess can be. dunno if this'll help, but good luck.
np, just a stab in the dark really. hope you get it worked out. also hope I'm wrong about the poss. of it being a virus. anyway, I wouldn't worry too much about svchost, it's actually a host proccess for applications that run from dll's, so it's pretty normal to have more than one of them. what I mean you should look for is something like this..(very generic example)
outlook.exe - spelled right
0utl00k.exe - spelled with zeros
at a glance you may not think anything of it, but subtle differences in files names are a common trick by the creators of viri to keep them hidden.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS