Wireless Signal Being Dropped with WEB 128 bit Encryption

With my Linksys Wireless G PCI card, I lose connection
repeatedly with WEB 128 bit encryption set. If I turn it
off, my connection is solid. With is on, Windows XP pops
up balloons letting me know I lost connection and re-
establishing connection. But the connection is broke long
enough to cause it to hang. This is either while internet
surfing or playing a game on the internet. I am using a
Linksys Wireless B Router. The distance is from one room
to the next with signal strength of excellent. Any ideas?