VERY slow file transfer over local wireless connection

Dear all,

I am having incredibly slow connection while transfering files using file sharing.

I have the below hardware:

108Mbps TPLINK Wireless Router TL-WR642G
108Mbps TPLINK Wireless Access Point acting as repeeter
laptops accessing internet and folder sharing enabled for local file transfer

Transfering of files excessively slow (after playing around with the settings was able to get 500KBps).

Any idea what I can do to resolve this?

I have set all wireless adapters on the laptops to 802.11g only.
Tried setting the router and access point to both 54Mbps and 108Mbps 802.11G only as well as b/g.

No solution uptil now, appreciate your feedback.