This Media center PC isn't exactly the most powerful system on earth, but for some reason, it cannot run streaming HD TV (DVB-T2) smoothly. Also on BBC HD sometimes it plays sound and sometimes not.
In the Task Manager the CPU usage is between 98-100% but on SD channels like BBC One and Dave it maxes out at about 20%.
Trying to watch HD Tv then going back into the main screen or EPG is a pain, takes about 10 seconds to respond to any button presses.
The install of Windows 7 64bit is as clean as can be. Just Antivirus, Google Chrome and MCE Standby Tool.
Whats strange is that 720p videos downloaded from the net, even BBC iplayer streams work absolutely fine with moderate CPU usage.
What is the problem, and is there anything I can do aside from building new from scratch?
AM2+ MSI motherboard
AMD Athlon x2 5600+ 2.8ghz
4GB DDR2 800mhz RAM
Intel 40GB SSD
Samsung 750gb 2.5" laptop hard drive
PCTV Systems Nanostick T2 290e USB TV reciever