System restore, by default, hogs 11% of drive space. This is the "C" drive and any partitions you have. If you were to have a 40 gig hard drive partitioned into two 20 gigs, the system restore would hog 2.2gig for each drive. Your drive looks to be just over 10gig, so system restore will be hogging 1.1gig of that "C" drive.
The recycle bin, by default, hogs 9% of drive space. So the recycle bin on yours could be hogging 0.9 gig, whether there is any thing i it or not.
This could account for 2gig missing.
You can resize the system restore settings to what you want, around 300 - 400Mb is not to bad.
The recycle bin can also be reset, right click the bin and pick properties. You will then find all the tools you need there. Mine is set at 1% of hard drive space.