To fix this issue, you just have to do some required changes in Task Manager settings.
1. Set Priority In Windows Task Manager window > Select Program any program by right clicking > Set priority > Below Normal
Sometimes system processes, such as services, it won't let you change. Firstly, pick "show all user's processes" which will ask for permission, but reopen task manager as an administrator, so some more processes will be changeable. But again, not all - some Windows will stop you changing the priority.
Alternatively, try going to
http://www.sysinternals.com and downloading "Process Explorer" - similar to Task Manager, but more features.
Hope this helps you...