Here am for ur help.To overcome this problem is very simple & Tricky. Lol just follow me guys !
This is depending on the type of Network Interface Card (NIC) you have. If you have a card that doesn’t support Clone MAC address,
Go to Start->Settings->Control Panel and double click on Network and Dial-up Connections.
Right click on the NIC you want to change the MAC address and click on properties.
Under “General” tab, click on the “Configure” button
Click on “Advanced” tab
Under “Property section”, you should see an item called “Network Address” or "Locally Administered Address", click on it.
On the right side, under “Value”, type in the New MAC address you want to assign to your NIC. Usually this value is entered without the “-“ between the MAC address numbers.
Goto command prompt and type in “ipconfig /all” or “net config rdr” to verify the changes.
Am sure it will work 100% for XP users. Enjoy guys.
If successful, reboot your systems