network speed fast one way slow other.

Hi I have been trying to research this all afternoon and can't figure it out. If i copy a file approx 100M from my desktop to my laptop it takes about 45s. If I try to copy the same file or other the same size from my laptop to my desktop it says it will take approx 49 min. There must be some setting somewhere I need to change. Here is my setup. Desktop connected to a netgear RP614 wired router. D-link Di-624 wireless connected to the RP614 used as a wireless access point. desktop XP pro Laptop XP home. The problem is only wireless. TIA