17% in temp files whatever the SSD size is, is to much... delete all Temp files:
1. Delete user temp files: Type "%temp%" in Start \ Run or Search and delete all temp files in the user Temps folder....
2. Delete system temp files: Type "Temp" to delete temp files from the System temps folder.
Temp files are only usefull while you are doing the specific task, they become obsolete when you log off, and should be deleted... frequency depending on the HDD/SSD size... Windows should auto delete them by default, but who knows why they havent thought of that... Check the article on how to program Scheduled Tasks for cleanup of obsolete temp files.
How To Automatically Keep Windows 7 Clean Of Obsolete Files
http://www.makeuseof.com/tag/automatically-windows-7-clean-obsolete-files/
3. The WinSxS folder can also be cleared automatically or manually... but you should read the article under Resolution for a full explanation on what it contains and if or how you should clean the folder.
How to address disk space issues that are caused by a large Windows component store (WinSxS) directory
http://support.microsoft.com/en-us/kb/2795190
4. CCleaner can also be used and programmed to automatically delete both temps and WinSxS files.
https://www.piriform.com/products
And following up on USAFRet's suggestions:
5. System Restore: The default maximum size for the System Restore folder is 12% of the HDD or partition size and it saves restore points for 90 days... but I doubt you ever have to ever restore the system to more than a month back... so, at least 66% of the Restore Points may never be used and only take up disk space.
How to reduce size of disk space allocated to System Restore.
http://www.tomshardware.com/answers/id-1813658/reduce-size-system-volume-information-folder.html
6. Pagefile: The default paging file size used to necessarily be up to three times the size of the installed RAM... but with the sizes of RAM used nowadays and more efficient processors, that paging file size can be unnecessarily excessive, but you can manually configure the file size to the same size of the installed RAM and not notice the difference... if you have a healthy amount of installed RAM, you can even run the computer without a paging file and barely notice the difference.
Optimize the Paging File in Windows 7/8/8.1
http://www.online-tech-tips.com/computer-tips/simple-ways-to-increase-your-computers-performace-configuring-the-paging-file/
7. Hibernation: If you don't use it, it's Hiberfil.sys file is only taking up disk space... if you disable Hibernation the Hiberfi.sys file is automatically removed. Sleep Mode is more practical and uses little power, just enough to keep session information saved to RAM memory.
What’s the Difference Between Sleep and Hibernate in Windows?
http://www.howtogeek.com/102897/whats-the-difference-between-sleep-and-hibernate-in-windows/
How to disable and re-enable hibernation on a computer that is running Windows
https://support.microsoft.com/en-us/kb/920730
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