On the start menu, go to "All Programs/Accessories/System Tools/Disk Cleanup".
After the initial scan, select "Clean up System Files" & it will rescan. Click on the "More options" tab & click on "Clean Up..." System Restore & Shadow Copies.
That should clear a bit more than just emptying the Recycle Bin.
Personally, I'd recommend Tuneup Utilities 2014, once installed click on the "Clean Up" tab & the rest should be obvious. Does cost, but you do get a fully functional 15 day trial.
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