I believe that the CanoScan FB 630P is TWAIN compliant, so try using Paint Shop Pro (version 5 or later), or Adobe Photoshop (if I recall, Photoshop calls it WAI, instead of TWAIN).
Within Paint Shop Pro 7, click File|Import|TWAIN|Acquire...
In case it doesn't work, I would try the evaluation version of Paint Shop Pro, which can be found at: ftp://ftp3.jasc.com/pub/psp704ev.exe
or look at http://www.jasc.com