When I turn on my PC, it boots fine. But - after a few minutes, it starts to go queer.
Sound stutters, games stutter, movies stutter and also when I Move the mouse it'll be smooth, then it'll stop for a second, then move, then stop and it'll keep doing this over and over. Basically, it makes the entire PC Sluggish.
HOWEVER If I close svchost Username: System with a memoery usage of around 20mb, the problem stops. BUT, this means I can't play mp3's, game sounds or movie sounds and also the Internet will not load any websites.
No idea why this is, solutions GREATLY APPRECIATED.
Svchost.exe is just an easy name to say. What this means is that you have services running from dynamic-link libraries (DLLs). The Svchost.exe file is located in the %SystemRoot%\System32 folder. At startup, Svchost.exe checks the services portion of the registry to construct a list of services that it needs to load. There can be multiple instances of Svchost.exe running at the same time.
Each Svchost.exe session can contain a grouping of services, so that separate services can be run depending on how and where Svchost.exe is started. This allows for better control and debugging.
Svchost.exe groups are identified in the following registry key: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Svchost
Each value under this key represents a separate Svchost group, and represents one instance of Svchost.exe. Each value is a REG_MULTI_SZ value and contains the services that run under that Svchost group. Each Svchost group can have more than one service_names extracted from the following registry key, whose Parameters key contains a ServiceDLL value: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ service
If you go to Start --> Run and type command, you can find out what the svchost.exe files corrispond to.
(Windows XP) Once you have the command line up, type Tasklist /SVC.
From the figures given I have checked my own svc files and one is about the size you mention.
svchost is not a virus file itself .. although there exists a possibility that it has been corrupted by one.