I have a similar problem, without the green bar. When I try to get into AH, I either get a system lock up at a white screen, before I ever get into AH, or the screen has "bars" on it and shimmers (this depends on high high or low i set the res) I have deleted the video7.cfg over and over and tried the various resolutions and 16/32 bit color.
Sys:
P3 933
256 MB Ram
ABIT CUV4X-C MB
ABIT 8200 GeForce3 (12.6 drivers)
SB Live Value 5.1
Soca