Have a look at this Mustek page:
http://www.mustek.com.tw/Download/driv_scanr/english/b1200cu.html
TWAIN Driver
and Panel
It says this is a TWAIN driver set for your scanner.
I am using my very old HP SJ5P scanner under VISTA as I did under XP
and W2K before it by installing old HP software and using the TWAIN
connection.
If you do this make sure that there is no leftover Mustek software for
that scanner installed by checking Add/Remove Programs.
Here are their installation instructions but check out everything on
that page for the XP installation:
Model Name: BearPaw 1200CU
Download Instructions:
1. If you have not install the software from your original CD,
please download the full software package (including the Generic
Scanning Module, the Twain Driver and the Panel) or the scanner will
not work.
If you have already installed the driver software, please
install the Twain driver and the Panel.
2. If you are using Netscape Navigator, please move your cursor over
the Download icon, then press the right button of your mouse and select
"Save As ..." to download the driver software.
3. You can save all software to the same directory. Then run each
installer after the download is complete.
4. If the installer asks you to Insert New Disk, please refer to
help.
So find the files you downloaded -- XPDriver.EXE & b1200cuv13.EXE [NOTE
the Download ALL ]-- right mouse click on the XPDriver.exe file and
select Compatibility. Set Compatibility to XP with SP2 and then check
the box [ x ] Run as Administrator. Then repeat that for the
b1200cuv13.exe file.
NOTE -- if you have an XP CD for your scanner you may be able to use
that -- look for the file that starts the installation (do not let
autoplay start it) which might be setup.exe and do the Compatibility
and Run as Administrator on that.
After installing and then connecting your scanner you should find that
you can scan from the Mustek software and maybe from some applications
but that the Print & Fax, if you have it, does not work; nor does any
other scaninstruction that is part of VISTA itself.
I'm perfectly happy with that with my old scanner that I mostly use as
a copier but you may decide that this is the time to buy a new scanner!
Let us know what happens.