Yaobing will have to answer this one. My guess would be an unsupported TV card. Which one is it?
Here are my registry entries. You might be able to get it going by setting things up manually.
Try playing a channel now that you have scanned. It should ask you for what it needs.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\JRiver\Music Exchange\1.0\Media Jukebox\TV Settings]
"VideoDevice"=dword:00000000
"AudioDevice"=dword:00000000
"VideoDeviceDisplayName"="@device
np:\\?\display#ativrvxx#5&f933f52&0&80000008&01&00#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
"AudioDeviceDisplayName"="@device:cm:{33D9A762-90C8-11D0-BD43-00A0C911CE86}\SoundMAX Digital Audio"
"UseFrameRate"=dword:00000000
"TimePerFrame"=dword:00051763
"UseTimeLimit"=dword:00000000
"TimeLimit"=dword:00000000
"MasterStream"=dword:00000001
"Capture File"="D:\Video\TempCaptureFile.avi"
"Last Channel"=dword:0000000b
"TVSizeHeight"=dword:000000db
"TVSizeWidth"=dword:000000e0
"Closed Caption"=dword:00000000
"Stay On Top"=dword:00000001
"Window Was Maximized"=dword:00000000
"Last Top Position"=dword:0000001b
"Last Left Position"=dword:0000031b
"Compressor"=dword:ffffffff
"Use Overlay Mode"=dword:00000001
"Want Preview"=dword:00000001
"Audio Line"="Line In"
"Country Name"="United States of America"
"Country Code"=dword:00000001
"TV Tuner Input Type"=dword:00000001
"Mixer Device"="SoundMAX Digital Audio"
"Fullscreen Mode"=dword:00000000
"Video Input Selection"=dword:00000001
"Video Position X"=dword:00000000
"Video Position Y"=dword:00000000
"Crop Edges"=dword:00000001
"Capture Audio?"=dword:00000001
"VideoCompressorDisplayName"=""
"Do Not Compress"=dword:00000000
"WinTV Driver Type"=dword:ffffffff
"Use Deinterlace Filter"=dword:00000000
"Has Physical Audio Connection To Sound Card"=dword:00000001
"Copy Captured File"=dword:00000011
"TV Standard"=dword:00000001
"Keep Aspect Ratio"=dword:00000001