Hi suhanamohammad,
Inspiron N5050 was shipped with Windows 7, 8 and Ubuntu OS only. Therefore, Drivers for windows XP are not available. Please share the model number of the wireless card shipped with the system. I will try to find the drivers needed. Please use the original system configuration utility from the link : http://dell.to/9Bx54
Enter the service tag of your system -> Click on System configuration tab -> Expand Components tab and share the information here
The wireless cards usually shipped with the N5050 are Dell Wireless 1701, 1702, 1502 and 1503.
Hope this helps. Do reply with the findings.