D3Derr-notavailable after installing a program from this site

hey guys, i just got a d3derr-notavailable just now. last major thing i did was install everest home to check my system specs. could this have a hand int eh problem? i was playing everquest 2 and the graphics just went away and i got the error when i tired to restart after i reinstalled the game.

im running a radeon x300 card and it was running just fine.

system is

asus board, p4 d 2.8 cpu, 1 gig of ram (2x512), radeon x300 gpu.

i cant find any help on the specific error.