Rather than eliminate an extremely useful and sometimes life-saving tool such as System Restore, then simply reduce the amount of space reserved for System Restore. 2 GB will at least give you some restore capability.
Turn Hibernate off:
go to an elevated command prompt and
POWERCFG -H OFF
Restart your computer. Command Prompt - Elevated
How to Open a Elevated Command Prompt in Windows 7
Reduce the amount of space used for paging purposes:
| type Advanced System | Advanced tab | Settings button in the Performance section | Advanced tab | Change button in the Virtual Memory section | Uncheck Automatically manage paging file size for all drives
You can either get drastic and choose no paging file or select a size to your liking.
Use CCleaner. Link in my sig.