|We can probably advise on how to reclaim space but don't pick off system files - what happened to you is almost always the outcome. |
For now, just off the top of my head:
Uninstall unwanted programs (properly using "Control Panel - Add/Remove Programs"). Do not just delete files.
Reduce the number of restore points (after the problem is sorted).
Install and run CCleaner Slim. Usually the space gained well outweighs the size of this program.
Reduce the number of saved videos if you can manage without them.
Put your own stuff onto an external HDD - they are quite cheap these days.
Always pop back and let us know the outcome - thanks