Is it normal? no.
Just go to the Device Manager and delete them all.
Then restart your computer. The Device Manager should then automatically configure each found device once.
(You may need your install disks.)
This assumes you are running, at least, Win98se (Device Manager prior to Win98se was not as refined as in "se", and WinXP is much better than that.)
Good luck.
Belarc Advisor has multiple instances for some devices in my system. It list my PC camera 7 times, the scanner is listed 10 times with 2 slightly different names and I've got way too many USB hubs.
Seems odd to me. It this normal?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic