have a dell inspirion 1525 dual booting Vista & Mac OS 10.5.8 with Chameleon RC2

all worked fine until i installed Chameleon RC3, now when i boot the MacOS partition i get a blue screen for a few secs with the black cursor, then the desktop appears all messed up, like about 8 rows of "scan lines". Vista still boots fine.

have tried safe mode and changing the graphics mode from within Chameleon, no joy.

all i wanna do is reinstall Chameleon RC2, but obviously cant due to an unreadable display.