Well, first off using generic drivers may or may not work for you. However, with desktop cards you are normally pretty safe with generic drivers.
Anytime you update any drivers you have to be ready for errors, especially if moving to a BETA release like 14.1. I would recommend staying with WHQL drivers only if you want the best chance of a trouble free driver upgrade.
First make sure you remove ALL traces of the previous driver with a program like Display Driver Uninstaller or similar program. After fully uninstalling and restarting your system install the latest WHQL driver from AMD. Then you should be good to go. If you want to venture into the Beta drivers, know that you may have sparatic functionality, degraded performance or even full system hangs and crashes. Normally I find AMD Betas fairly good, but I do not recommend the 14.1 Beta (in it's current form from Feb 1, 2014)
For the record, one of my other systems is running a single HIS 7950 Reference card and it runs very well off the current WHQL and on the current Beta as well.
Desktop: FX8350 @4.7Ghz, Gigabyte 990FXA-UD7 Motherboard, 16GB Corsair Vengeance @1.7Ghz, Dual Asus R9 290X DCU2 @ 1.1Ghz, Kingston HyperX & V300 128GB SSDs, 4TB HDD, CM Inferno Gaming Mouse, Logitech G510, 3x Acer 223W Monitors@5040x1060, Antec DF-85, Corsair H100i, Corsair HX1050 PSU.
Laptop: MSI GX70: AMD A10-5750 @3.5Ghz, HD8970M @1.1Ghz, 16GB Corsair Vengeance @1.6Ghz, 250GB Kingston HyperX SSD, 1TB SSHD, 750GB Seagate, Gamdias Demeter Gaming Mouse, CM SF-17 Cooler.