Most scanners use something called
TWAIN as an interface which almost all imaging software can communicate with. If your scanner is currently working you should be able to install any software such as Picasa from Google or GIMP, both of which are free, and access your scanner from within that software. The good thing with TWAIN is that it looks identical no matter what software you are using.
I'm using an old version of Paint Shop Pro 8 mainly as I'm comfortable with it and the results are good.
Scans on Flickr