Deleting Hiberfile won't solve anything, it will re-create it on shutdown. You have to disable it, I would suggest you don't, so won't tell you how but a quick search will.
Deleting your System-restore would be priority 1.
Right-Click "My Computer" - Properties (or Control Panel - System)
Advanced system settings
System Protection
Then either resize the allotted space, or delete current data entirely (up to you if you want to re-enable it after).
If you choose to resize, you might have to run disk-clean-up before it actually resizes.
Page/Swapfile can be resized as well from that same dialog: Advanced - Performance - Settings.