Linux Mint Debian Edition 32-bit. but like there’s no way you’re gonna do anything useful with it. source: I have a C2D, so at least double as fast, max 4 GB RAM (doesn’t use all of it), X1600 graphics. that thing is unusable for anything.
granted, if you wanna enter your thoughts in some rudimentary text editor and just go CLI only, maybe you can have a whole week before you realize it isn’t worth it. huge power draw, terrible performance, a battery that lasts half a second and a screen that you can sorta-maybe-sometimes read.
quad core laptops with IPS screens that can run up to 16 GB are like $50 nowadays. throw it out.