My host process for windows services has stopped. Tell me why?

Once in a while usually this kin of circumstances arrives and it happens.. but not quite often though.. mif it happens to one system at a time.. it may repeat to that particular system again and again unless you take it to some technical software expert.. Windows Vista may just pop up around with an error message saying -Host Process for the Windows Services Has been Stopped Working- which generally has a problem details point to the svchost.exe application and the fault module name of rasmans.. unloaded. The error also appears to be occasionally in Windows 7, or just start occurring suddenly, experienced by the early testers who then managed to download Windows 7 pre-beta build it up and then install it on their system for the normal usage. The exact reason for the “Host Process for Windows Services that Has been Stopped Working error to happen is unknown, although, there is a workaround fix to stop the margin or error from ever appearing again. And. How ever this seems working though.. thank you..