It's most likely a program on your startup list.
To turn it off do this: (Win 98/Me/XP)
1. Go to
Start > Run
2. type in:
msconfig
3. Click on the Startup tab farthest to the right on top.
4. scroll down the list that appears til you find the motman reference and uncheck the box in front of it.
5. click OK at the bottom.
6. restart the PC.
If it's not on the startup list, then it may be associated with something that is on the list. Copy the list and post back here if this is the case. I'm sure someone will be able to figure it out with the right info.
good luck.