Thinkpad R40 and Wireless

I have an R40 Dual Boot system - win xp pro sp2 and win98se. I am
connected wirelessy to a router.

When I check my speeds in win98se, they are as they should be. However,
when I check them in win xp (latest wireless drivers), they are reduced
by about 25% (4200mbs vs. 3400mps).

Any ideas as to what is happening?

Thanks,
Harvey


Harvey Gratt