Huge files on my computer

I have a 160G hard drive, and since I keep my data on my external drive, it shouldn't be full. I found the following big files:

hiberfil.sys system file 2G
pagefile.sys system file 2G

Folders:

RRbackups 88.4 GB
SWTOOLS 1.88 G

What is RRbackups? The date modified is 12/26/2007. I'm thinking I can delete this, but wanted to make sure.

Also, in Program Files, there are folders for programs that have been removed from my program list. Can I delete these folders?

Thanks so much for your help.

Terri

 

I wanted to add one thing to the question above. The folder "RRbackups" is a lighter color yellow. I'm not sure what that means.

 

Thanks so much for your response, Mark. I have a program called "ThinkVantage Active Protection". Is this what created the RRbackups folder? I don't see ThinkVantage Rescue and Recovery in my add/remove programs list, but I do get a message just about everyday that says "ThinkVantage Rescue and Recovery does not have enough space to run" (or something like that).
Can I delete this program and the huge file?