Alrighty, i'll do my best to explain:
i bought(brought? i buyed it then

) 4 days ago, worked wonder after i fixed the normal "abnormal exit", however i had no sound

ofc the game worked anyway, a bit disturbing as i couldn't hear the warning signals but meh, it was fun anyway
3 days ago however the sound returned!

and the game didn't slow down, didn't crash(well it do crash sometimes, but those "sometimes" have only been twice in four days) or anything, i were so happy, however 2 days ago, the sound dissappeared again!

i didn't think much of it except the fact that it was sad, i hoped it would return, and lately the sound has "returned". but only during startup when the SEGA logo comes up, but the rest including the U@W:EA vid showing the humans getting owned by hierarchy(hierarchy all the way) and everything past that, but when i exits the game, the sound returns only so i can hear part of the "music" that would play during selection screen(where i choose options, campaign, exit and stuff)
now then, i understand some of you would like me to post computer-stuff like graphic card, sound card and such in order to help me, then i need help to know how to find it out :S
sorry for being stupid, the only thing that interests me are games, not the computer itself so i dunno the gamepreqs or w/e, i were just told it could run StarCraft II without problems at max graps(and it can, and i've never had any problems with sound thus far)