Hi
Do you have a SSD + Hard disk or just a SSD?
Restore points can use up a lot of space.
Clear them out and set maximum space they can use.
Similarly empty the Recycle Bin & reduce space allowed
Did your system come with W 7 SP1 or W7 and latter sp1 installed.
The backup directory for W7 may still be there.
ccleaner can help clear out temporary files
IE & other browsers locally store files which were viewed and need clearing out from time to time
for guides on the subject (with pictures)
http://windows.microsoft.com/en-gb/windows/strategies-freeing-disk-space#1TC=windows-7
http://www.howtogeek.com/125923/7-ways-to-free-up-hard-disk-space-on-windows/
https://www.google.co.uk/?gws_rd=ssl#q=windows+7+make+free+space
regards
Mike Barnes