film scanner Nikon Coolscan V ED

I have the film scanner Nikon Coolscan V ED and want to know if anyone here use this ?
I try to find help for a problem but Nikon website doesn't speaks about film scanners (just cameras) and I tried Yahoo/Google search for some other sites/community board/discussions without success. I figure that people here might have a film scanner. Or can anyone direct me to a site that might help ?
Thank you.
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Just in case someone here has this scanner I will post my problem too.

For some reason I did not install the reference manual and now that I want to install it, I can't because I have a problem with my computer (the DVD tray doesn't open).
Anyway, I need to find ASAP a solution to this problem:
When I scan a slide, the quality is good just like the slide. Then I save it to a folder, close the file and then go to the folder to reopen it (to check) and the image is grainy ! I tried numerous variations (file size, number of pixels per inch, etc.) but they all come grainy.

I'm sure (well, I guess) the explanation is in the reference manual on CD but as I said, I can't access this now. The print manual, which I have of course, do not mention this.
Please help.

Just in case there's a relation:
My monitor is, for years, on 800x600 because the recommended resolution makes the text too small. However I have literally downloaded thousands of JPEG pictures from the Web and the quality is excellent. So shouldn't my pictures be the same ?