Cleaning up my HD
Have a question about my harddrive and a big section that is unmoveable info/files. After some research I believe it relates to System Restore Points. Here is a screenshot of what I'm looking at:

I want to keep restore points but I'm thinking that this is probably too many. I'm running Windows 7 64 bit. So my questions is what is the rule for how much space to allow and where do I make that adjustment? I do weekly backups of the harddrive when I do my computer maintenance.
Thanks in advance for any and all help.