get a can of air duster to blow off the dust is preferable to a hoover... but as said above really ....... dust dust and dust lol
bsod is not uncommon to pc's lol normally caused by graphics card fans getting clogged with dust, cpu heatsink getting clogged with dust or memory failure ..
im guessing at the cpu fan/heatsink or gfx card fan.. take the side off and look for dust ...