I got the card to work on Win 7 (32 bit) using the good old official XP Microsoft Driver
downloaded form their site. (Yes the supposedly non-Vista and Windows 7 compatible one) I just updated to Win 7 on this computer and the MN-730 is the network card I'm using right now.
It takes a bit of a quick hand however to get it installed.
1. Grab the driver from Microsoft.com and get the driver (MSBNDownload.exe): MSBBN: How to update the firmware and software for your Microsoft Broadband Networking device
2. Run MSBNDownload.exe and choose a place for it to unpack itself
3. While it is running it will eventually tell you that it doesn't support your OS (or something similar) however it will have unpacked a lot of files into the folder you specified
4. Open that folder full of files and find MSBN.MSI
5. Make another new folder elsewhere and open it
6. Run MSBN.msi and tell it to use the folder you just created
** next is the tricky part ***
7. While MSBN.msi is running it will momentarily unpack the actual driver (.inf files etc.) into the folder you created above. When they appear, quickly select all (ctrl + A), copy (ctrl + c) and paste (ctrl-v) them elsewhere. (If you aren't quick enough the program deletes them when it detects that your OS isn't supported)
8. Open device manager, and choose your network adapter (the one that isn't working)
9. Use the old fashioned update driver options and choose 'Have Disk'. Go to your folder of sneakily copied driver files and choose mn720.inf ( I know, not 730, but it works great on the 730 )