*sigh* there is already 6 or 7 existing threads about this specific topic...... Can you all do me a favor? Use the forum search engine so that we do not have duplicate posts...
For the answer, you need to
Install the OS
Install Via 4-in-1 (skip the AGP one)
Installed the AMD miniport driver + chipset drivers and INF
Installed the rest of your drivers. (nVdia, SBlive, etc...)