I am using the Safe Mode with Networking mode (SF+N) since months ago, and I checked almost any "flags", or settings to get sound and DirectX and other things.
Weeks (actually 1-3 months) ago I found a registry file for sound in Safe Mode (both variations).
I added services and drivers to the registry key for SF+N, located at
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeMode\Network
and I used what I had (not yet DX or AGP)...
...until yesterday, when I inspected the divers and driver details using the Windows Explorer and 7-Zip (for signature checking & function & etc.).
Then, voilà: DX works; SF 2.0 works; Warsow works; I reinstalled Advent Rising and GalCiv2 - both working now,
got not only DX, but also AGP: OpenGL programs are smoother and faster.
And I got again less than 10 GB of HDD space free
