freezing problem and cant watch two channel on tbs5990

i have problem freezing when i exit progdvb .
other problem cant open two channel in same time :x . ( i try last 4 version x64 and x32).
this problem disappear on dvbdream but i cant use it because i used progdvb more than 4 years
i wish you can help me
my card tbs5990 ( dual tuner) usb
system : win 8.1 64bit
cpu : core i7 4700hq
ram : 24gb ddr3
gpu : gtx 780m 4gb
progdvb tv source