Not enough conventional memory? That would mean you have the old DOS version....
To get into true DOS, press F8 while the computer is at the summary screen, right before it says it's loading Windows. Then, choose step-by-step confirmation. Here are some of the things you don't want your computer to load:
DoubleSpace Driver
DriveSpace Driver
DBLBUFF
Setver.exe
IFSHLP
Of course... it helps if your autoexec.bat and config.sys files have links to DOS device drivers for your sound card, because WC isn't the same without it. Short of that, all you should need to load into memory are:
command.com
The system registry module
mouse.com (or mouse.exe)
Sound card drivers
HIMEM
EMM386
People say you don't need HIMEM and EMM386, but I find that it opens the Upper Memory Area, and dumps some stuff there that would otherwise be dumped on the conventional memory. Oh, and you can't get into true DOS if you use Win2K or WinME.
Hope that helps.