Hello balinbob. Welcome to Wolvix.
I've created packages for the Nvidia drivers, ready to install with a few clicks. I recommend you have a look the this wiki page for details:
http://wiki.wolvix.org/NvidiaDriversThe hardest part about configuring X (xorg) is getting the refresh rates (horizontal/vertical) right for the monitor(s). A Google search with the make and model usually gives results though, unless you have the manuals, which should have this info.
Setting up dual monitors is not so hard, even with different resolutions on the two screens. I'm typing this on a dual setup with one 1600x1200 and one 1024x768 screen. Here's my configuration:
Section "Device"
#VideoRam 262144
# Insert Clocks lines here if appropriate
Identifier "GeForce"
Driver "nvidia"
Option "TwinView" "1"
Option "MetaModes" "1600x1200,1024x768; 1024x768,1024x768; 1024x768; 800x600,800x600; 800x600"
Option "TwinViewOrientation" "RightOf"
Option "SecondMonitorHorizSync" "30-70"
Option "SecondMonitorVertRefresh" "50-100"
Option "ConnectedMonitor" "CRT,CRT"
EndSection
The magic with the different resolutions here is in the MetaModes line: 1600x1200,1024x768
The error about PNG you get is not related to your Xorg setup, it's a bug in the png package from Slackware, but I've got an update for it in the repo. There are plenty of other package upgrades in the repo too, bit from Slackware and Wolvix, but note that slapt-get/gslapt needs to be upgraded before you use it to install from the Slackware repo now. For details see here:
http://forums.wolvix.org/index.php/topic,1362.0.htmlAlso note that since you're running Wolvix from live from USB, the xorg.conf will be re generated at each boot, unless you give the 'noxconf' cheat code. This is not the case for HD installed systems. You can add the cheat permanently to the USB install by editing /boot/syslinux/syslinux.cfg on the USB
DISPLAY /boot/splash.cfg
PROMPT 1
TIMEOUT 300
DEFAULT wolvix
F1 /boot/intro.txt
F2 /boot/help.txt
F3 /boot/codes.txt
F4 /boot/vga.txt
F5 /boot/splash.cfg
LABEL wolvix
KERNEL /boot/vmlinuz
APPEND changes=wolvixsave.xfs max_loop=255 initrd=/boot/initrd.gz ramdisk_size=6666 root=/dev/ram0 rw vga=791
LABEL memtest86
KERNEL /boot/mt86p
Add any additional cheats you want to the APPEND line.
Hope this helps you get the setup you're looking for. If you're having problems feel free to ask and we'll try to help as best we can.