Hello, I just downloaded the latest version of dgvoodoo2 in order to play the game in windowed mode but for some reason it ruins the graphics whenever I load the game via dgvoodoo2 (game textures become completely white etc.)

Anyone that can help me with this problem?

Why play this ancient game in windowed mode in first case? Doubt anyone can help without knowing what your hw is and what settings you are using actually...

nobody can help you with that. dgvoodoo is a glide wrapper and sacrifice does not support glide.

You are wrong. The API's it currently can wrap are:
- Glide 2.11, Glide 2.45, Glide 3.1 and Glide 3.1 Napalm
- DirectX 1-7 (all versions of DirectDraw and Direct3D up to version 7)
- Direct3D 8.1

Sacrifice uses that last one(in some installers it wanted to install it) :)