Can you copy your system info from MC Help and paste it here?
For Version 11:
Media Center 11.0.88 -- C:\Program Files\J River\Media Center 11\
Microsoft Windows XP Workstation 5.1 Service Pack 2 (Build 2600)
Intel Pentium 4 2655 MHz MMX / Memory: Total - 1048 MB, Free - 524 MB
Internet Explorer: 6.0.2900.2180 / ComCtl32.dll: 5.82 (xpsp_sp2_rtm.040803-2158) / Shlwapi.dll: 6.00.2900.2180 (xpsp_sp2_rtm.040803-2158) / Shell32.dll: 6.00.2900.2180 (xpsp_sp2_rtm.040803-2158) / wnaspi32.dll: N/A
Ripping / Drive G: Mode:Normal Type:Auto Speed:Max
Drive H: Mode:Normal Type:Auto Speed:Max
Drive Q: Mode:Normal Type:Auto Speed:Max
Drive R: Mode:Normal Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: No / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive G: LITE-ON LTR-24102B Addr: 1:0:0 Speed:24 MaxSpeed:24 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: No / Normalization: None
Version 9, meanwhile, won't boot properly now that I've installed Version 11. They are in separate folders. If necessary I'll reinstall 9 yet again, but isn't this a lot of loops to jump through just to upgrade?