if whatever that process is loading up is halting everything, try putting procexp in the startup so that it hopefully loads up before this thing does so that you can track it.

or you can try ccleaner or something like it, like chris suggested, but you probably should find out exactly what's running.

btw, svchost is exactly what it says... it's a host for running programs/services, which is why i suggest you use procexp to look into it.