SVCHOST.EXE is apart of the windows system. In any operating system there are tasks which cannot be performed by the user in order to create stability - the last hting you want is for the user to try to communicate directly to the hard drive and then erase it. Thus, when you access the hard drive you are actually calling a windows process to does the communication for you.
In that same method of thinking, SVCHOST.EXE is a process in windows which is used to start, categorize, and run the services in your system. What such services you ask? You can type msconfig in start to bring up a windows which will show you your starting programs and services. There can be many SVCHOST's at the same time because that allows multiply servicses to run concurently. If it is getting stuck at 100% then it may be a service which is having a problem and an even smaller chance that it could be junkware. Remember, you can name a virus explorer.exe if you really wanted.
If you are concearned about it being a virus or other junk then you can use um, i think its listtask or tasklist in the console to see the list of running processes and it also shows weather they are programs running or services. (programs probably show up as user or console). If yo see one of the svchosts under services then its normal part of windows, if its under user or console then it is probably junkware.
soooo can you tell me why sometimes one of them will shoot to 100% (cpu usage) is it a virus or something?
