has it ever occured to maybe switch to 64 bit win 7 add more ram and the CPU usage will probably drop
that is if you feel like spending some money for an upgrade and if you have a OEM windows even better get rid of all that useless junk that comes with the laptop from the maker
But finding
driver might be the hard part since you are using a 9400m GPU but some research you could get it working alot more efficient with more ram and a 64bit windows