...ok here goes.
right click your SH3 icon on your desk top. open compatability tab. go to 'run this programme in...' and choose Windows xp (service pack 3) click 'apply' close tab and give it a go. you may also have to run the game in 'Administrator' mode which i dont know how to do. have a look at these threads i had on the very subject not so long ago.
http://www.subsim.com/radioroom/showthread.php?t=189803
keep posting here with your results and problems. hope this helps and dont give up - you'll get it running soon
