Found the solution to my problem.  Manually explored this page: [URL] and downloaded the driver that actually fit my network adapter.
Hi there, So I bought new Dell Inspiron 17R (5737). I got it with win7. So I installed all drivers except for wireless network adapter. At first, I've tried to download the driver from support page by using service tag, but as I was installing an error popped up saying that my pc is not compatible with  Intel WiDi. So I followed to the requireenst list: [URL]#portal/1026/article/2511  So in Device Manager I extracted the Ids of the Network Controller: PCI\VEN_8086&DEV_08B1&SUBSYS_44628086&REV_73PCI\VEN_8086&DEV_08B1&SUBSYS_44628086PCI\VEN_8086&DEV_08B1&CC_028000PCI\VEN_8086&DEV_08B1&CC_0280 By looking in hardware id database, I found out that my wireless network adapter is Intel(R) WiFi Link 7260 series. Tried searching drivers for it, but had no luck so far. Could anybody lend a helping hand?
Problems installing wireless network driver