I'm on XP SP1, just built a new AV db yesterday, ranked files from MC show up fine. (too bad the rankings don't transfer though).
Using 302, db built everything in my library, and boy do I love AV!
Not using lyrics or bios so I'm no help there.
WP
Media Center Registered 9.1.302 -- D:\Program Files\J River\Media Center\
Microsoft Windows XP Workstation 5.1 Service Pack 1 (Build 2600)
Intel Pentium 4 2997 MHz MMX / Memory: Total - 1047 MB, Free - 638 MB
Internet Explorer: 6.0.2800.1106 / ComCtl32.dll: 5.82 (xpsp1.020828-1920) / Shlwapi.dll: 6.00.2800.1106 (xpsp1.020828-1920) / Shell32.dll: 6.00.2800.1106 (xpsp1.020828-1920) / wnaspi32.dll: Internal ASPI Layer
Ripping / Drive E: Copy mode:Normal CD Type:Auto Read speed:Max
Drive I: Copy mode:Normal CD Type:Auto Read speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: No / Copy volume: 32767
Eject after ripping: No / Play sound after ripping: No
Burning / Drive E: _NEC DVD_RW ND-1300A Addr: 1:0:0 Speed:16 MaxSpeed:16 BurnProof:Yes
Drive I: YAMAHA CRW2200E Addr: 1:1:0 Speed:20 MaxSpeed:20 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: No
Use playback settings: No / Normalization: None