i never use to have this problem with lightroom, and it only jumps in usage after using it for a little while, could it be somthing to do with full hard drive? or somthing?? i have no idea
You mention here that your hard drive may be full. If it is, you will find your brand new(ish) laptop running like snot. Windows operating systems often use the hard drive as a sort of "memory extender" i.e. use spare space on the hard drive to swap information in and out.
The computer as a whole will run rubbish, but this will be particularly noticeable with high utilisation applications (i.e. Lightroom).
Unfortunately for us Windows users, it is best to have a few GIG spare space on your Operating System harddrive to ensure that your computer works best.
Hopefully this helps you out......