VTM: Bloodlines.
Ouch...
That game is horribly unoptimised. I used to have a P4 2.8Ghz / Nvidia FX5900 Ultra / 2Gb ram desktop, and it was sluggish on that one. It might be possible to get it to run, but I doubt that it will run at a playable speed, i.e. it might not be fun.
Something tells me it was a conflict with an individual component or driver on that machine because, while I accept that Bloodlines isn't terrific at optimisation, I got by fine with it on my Tablet PC which was a 1.4 Ghz Intel Centrino M with a Geforce 5200 @ 32 mb, with 256mb of CPU RAM. Framerate became sluggish at times but it was always more than playable and generally smooth.