Hi Hrushikesh,

Thanks for the post. Looks like you’re going to need to update the systems Chipset and Ethernet drivers from what you have missing there. Try installing the driver updates from the links below.

Intel HM57/HM67 Express Chipset Family Driver

http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=CMR32&fileId=2731102127&osCode=W732&productCode=vostro-1550&languageCode=EN&categoryId=CS

Realtek RTL8111E-VB Gigabit and RTL8105E-VB 10/100 Ethernet Controller Driver

http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=DHJ2D&fileId=2993730947&osCode=W732&productCode=vostro-1550&languageCode=EN&categoryId=NI

You can also use the Dell System Software Utility to scan and update other system components. This software can be downloaded here http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=PNHCT&fileId=3289908889&osCode=W732&productCode=vostro-1550&languageCode=EN&categoryId=UT

Thanks,