You can address this in the Ten Forums via the link at the bottom of the page.
However, you can go to Start, All Programs, Accessories, System Tools and run the Disk Cleanup utility. When it says how much space it can regain, make sure that the Temporary Files and Recycle Bin boxes are checkmarked. Let it run. When it's done, reboot.
If you have a hard drive, run the Disk Defragmenter.
If you have an SSD, the trim function should run automatically to recover the space gained above. This applies to Win 8 and later. In Win 7, one must run the trim function manually.