Same freezing of the GUI on my system.
If this is of any help, it is not only releated to nvida GPU.
My system:
Windows 7 Ultimate 64 bits with 8 Gig of RAM
Intel DP55KG motherboard
i5 CPU
ATI Radeon 5870 (the only one supporting DirectX 11 so far)
Catalyst 9.10 video drivers
Samsung 2443BW monitor connected through DVI