Type services into "search programs and files" hit enter, scroll down to TCP/ip NetBIOS helper service, set to automatic start up and save settings. That should get the network discovery setting working again for you.
If you are running Kaspersky A/V more steps may be required.
Computer type PC/Desktop System Manufacturer/Model Number Home built OS Windows 7 Ult, Windows 8.1 Pro, CPU Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHz Motherboard Evga 780i FTW Memory G.Skill PC2 9600 1200Mhz 5 5 5 15 2T Graphics Card GTX480 Sound Card Asus Xonar D2 Monitor(s) Displays HannsG Screen Resolution 1680X1050
Keyboard Logitech G15 Mouse Logitech G9 PSU ThermalTake Toughpower 1000Watt modular Case ThermalTake XaserV Cooling Xigmatek S1283 Hard Drives GSkill Phoenix Pro 120GB SSD Internet Speed T1