What exactly does the message say? We'll see if it's coming from MC.
I get this too. First thing I checked was the options to see if the temps were pointed to C:\ which on this system is a small partition for Windows files. Nope, that's not it, but since the main partition (E:\) has some 40 gig available then it's possible that some code is looking at C:\ instead.
I just took this for yet another really annoying MC 9.1 bug.
Tom
Media Center Registered 9.1.316 -- e:\Program Files\J River\Media Center\
Microsoft Windows Me
AMD Athlon 1474 MHz MMX / Memory: Total - 458 MB, Free - 197 MB
Resource Info: System - 53 %, GDI - 77 %, User - 53 %
Internet Explorer: 6.0.2800.1106 / ComCtl32.dll: 5.81 / Shlwapi.dll: 6.00.2800.1276 / Shell32.dll: 5.50.4134.100 / wnaspi32.dll: 4.60 (1021) , ASPI for Win32 (95/NT) DLL, Copyright © 1989-1999 Adaptec, Inc. / Aspi32.sys: N/A
Ripping / Drive G: Copy mode:ModeSecure CD Type:Auto Read speed:Max
Drive H: Copy mode:ModeSecure CD Type:Auto Read speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: No / Play sound after ripping: Yes Soundfile: C:\WINDOWS\MEDIA\Utopia Asterisk.wav
Burning / Drive G: LITE-ON LTR-40125S Addr: 0:0:0 Speed:40 MaxSpeed:40 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: No / Normalization: None