When using your nVidia GeForce 6200 with Slackware 13.37 the decision tree is this.
Driver - |__ nouveau (open source driver that is already present in Slackware 13.37)
|__ nVidia proprietary (closed source driver)__ Installed using nVidia installer
|__ Installed using Slackbuild
The nouveau driver works well but lacks support for some features. e.g no desktop cube in KDE
The proprietary nVidia driver needs to be installed, but will provide all features that your card can support.
The nVidia proprietary driver can be installed directly by downloading the appropriate driver for your architecture (32 bit or 64 bit) from http://www.geforce.com/Drivers
and, as root in a console in run level 3, running 'sh <driver>.run'. This will build the appropriate kernel modules, install libraries and prompt to create an xorg.conf file. This can be very convenient for starting out, as all the appropriate device options for your card will be entered into the created xorg.conf. The nVidia installer also now automatically blacklists the nouveau driver. This means that there will be no conflicts between the nouveau driver and the nVidia driver for your graphics card. There is a package in the /extra directory of the Slackware 13.37 media, xf86-video-nouveau-blacklist.txz, that can be installed that will do the same thing.
The alternative way to install the nVidia proprietary driver is to use the Slackbuilds available at http://slackbuilds.org/result/?search=nvidia&sv=13.37
. For your hardware you would need to build and install the nvidia-driver and nvidia-kernel packages. There are more details available at the link.
For a recent discussion of the merits of the two proprietary driver installation methods see http://www.linuxquestions.org/questi...taller-931833/
Your situation is made more complex by the presence of the on-board graphics device. The key piece of information used to differentiate graphics devices is the BusID option in xorg.conf. Running 'lspci' will give you the information you need.
There are pros and cons to all the above. The nouveau driver is easier to maintain. If you upgrade the kernel then the nouveau driver is automatically updated and no further action is required.
If you upgrade the kernel then the nVidia driver will need to be reinstalled.
Sorry for the long preamble, but you have decisions to make.
If you want further help, please post the output from 'lspci' as well as the file output by 'X -configure'. If you try to start X and have problems, also post the contents of /var/log/Xorg.0.log