Wasn't the Nvidia driver included in the install?
Also, I haven't figured out auto-mounting of my many Linux partitions within Vector...
Menu, System, VASM, SUPER, FILESYSTEM, MOUNT
is Vector 5.9 compatible with the Wine downloads linked from the Wine download page for Slackware?
Most Slack packages work under VL, but they don't have dependancy checking, nor do they usually have a .desktop file, so your newly installed package probably won't give you a menu item in either xfce or KDE.