When you say the "OS can't recognize the card", does that mean it is not
listed in Device Manager? Or does that mean it is listed but with a
yellow exclamation mark?
If listed by shown as non-functional, isn't one of the Creative driver
listed when you go to select one usable for that device?
If none of the devices are for the Blaster modem (and a generic modem
device won't work) when you look under Creative and Creative Technology,
you might have to pick one of the modem chipset makers, like Conexant
(or whatever is on the modem card).
http://support.creative.com/Products/product_list.aspx?catid=7&CatName=Networking+/+Internet#
Click "Analog", look under "Archived Products" column.
I saw lots of device drivers for several models of Modem Blaster (19 of
them) at Creative's web site. You didn't like any of those? I didn't
see the 5630 model listed but then several of the listings didn't have
model numbers, just a type of modem card. From their help article at
http://ask.creative.com/wwenglish/modems/TS_DI5630_3.HTM, it's a PCI
card. There was no mention of v.90 support. So the listing got
shortened by eliminating any cards not mentioning PCI and those that
mentioned v.90 which narrowed it down to the Modem Blaster Flash 56 PCI
card. When I selected that one and clicked Next, one of the drivers
(for Windows XP) says it is for the model 5630-5. I saw drivers for
Windows 95/NT4/2000/XP. None were for Windows Vista/7.
Since this is archaic hardware that has long been unsupported, Creative
won't be expending any resources to update drivers on an unsupported
product. The product's support died back in Windows XP at the latest.
Since you can get a 56K analog data/fax modem with Windows 98SE/ME/2000/
XP/Vista(32&64bit)/Win7(32&64bit) for just $8 (at Newegg), you sure you
want to spend the time dealing with the outdated hardware with no
appropriate driver for it?