If you open up task manager then right click the process under the processes tab there's an option to 'set affinity' which allows you to select which CPU cores to assign to that process.
There's also an option to 'set priority' which lets you choose what resources to give the process.
Might work, might not.
edit: um, just tried it on the 'system' process - access denied.
EDITED: 10 Sep 2013 03:54 by CYNICOID