Hi Nikhil,
I have the same problem too...reinstalled Windows 7 and drivers are lost.
Here's the details:
Dell Vostro 2520
Network Controller
PCI\VEN_14E4&DEV_4365&SUBSYS_00161028&REV_01
PCI\VEN_14E4&DEV_4365&SUBSYS_00161028
PCI\VEN_14E4&DEV_4365&CC_028000
PCI\VEN_14E4&DEV_4365&CC_0280
PCI Simple Communications Controller
PCI\VEN_8086&DEV_1E3A&SUBSYS_05581028&REV_04
PCI\VEN_8086&DEV_1E3A&SUBSYS_05581028
PCI\VEN_8086&DEV_1E3A&CC_078000
PCI\VEN_8086&DEV_1E3A&CC_0780
SM Bus Controller
PCI\VEN_8086&DEV_1E22&SUBSYS_05581028&REV_04
PCI\VEN_8086&DEV_1E22&SUBSYS_05581028
PCI\VEN_8086&DEV_1E22&CC_0C0500
PCI\VEN_8086&DEV_1E22&CC_0C05
please advise.