Hi Michael,
Most drivers for Me are now part of the 9X drivers.
Only W2K/XP require special drivers.
Make sure that the modem does not show up in Control Panel / Modems. (if you remove modems from here, you shouldn't need to search the registry to remove the keys)
Are you sure this is a Motorola, and not a PCTel modem? The hsp56 modems that I have used had PCTel chips on them. I usually use the chip manufactures driver as their reference drivers are updated more often than many card manufactures.
I have downloaded drivers from card manufactures only to find that the drivers on their web sites were older than the drivers that shipped with the card!
If I recall the HSP56 modems correctly, they want you to install the driver before physically installing the modem.
If you still have problems, try the modem in a different slot.
I noticed that you asked a question on a posting I made on scandisk and defrag.
I recommend that users with disk problems run these tools from safe mode for 2 reasons;
1. Most background (tsr) programs are not loaded in safe mode. So the problem of disk access causeing the utilities to stop is avoided.
2. With the minimal driver set that is loaded in safe mode, the swap file is thesmallest it will ever be. This allows more of the drive to be fully defragmented.
Chas