BSNL wifi help

[Ray]

I have 1 desktop and 1 laptop.
The desktop is connected to Siemens SL2_141 ADSL router via ethernet cable(It has no wifi card).
The laptop has Intel 5100 AGN wifi card.
My laptop has Windows XP pro and Desktop has Windows 7.

I can connect to the internet with desktop and laptop simultaneously now.
1.How can I share files between the computers wirelessly?

[nims11]

have u set ur pppoe_0_35_1 connection as default connection?