issue installing graphics card driver in Debian (sluggish KDE)

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http://www.linuxquestions.org – I have an NVIDIA GTX 260M card which is one of the more high-end mobile graphics cards, and so should certainly be able to handle any GUI. All that I've read has said that Debian 5.x should have built-in support for NVIDIA cards. But when I'm logged in, all the menus and stuff in KDE are really sluggish and frame-skippish. So I naturally assume, no built-in graphics card support. Since so far I can't figure out where in Linux I have to go to look at my hardware specs (to see if my card is recognized), I get online download the applicable proprietary driver file. Due to my job, I'm about 6 months away from having internet access to my own laptop, where the problem is occurring, so I have to download it on my work computer and copy it over. I find the necessary driver file from nvidia.com, NVIDIA-Linux-x86-190.53-pkg1.run (I'm using a 32-bit version of Debian, even though my laptop is quadcore). Now, I can't figure out what to do to install this .run file. Double-clicking it seems to do nothing but open a text file and then lock up my computer for half an hour. What do I need to do to get my card working now? Thanks for the help (HowTos)