Hi, i earsed Max OS X Lion on my Mac by installing Win7 64bit Ultimate. I didn't use any BootCamp because i wanted as clean installation as possible (my Mac is old and couldn't run the latest OS X version fast enaugh). Now i expirience serval issues such as tracpad problems (right click, scrolling), sound issues (no sound at all), eject button doesn't work and bottom left FN button doesn't react. The thing is that i don't have anything OS x-ish left in my Mac and i also don't own any OS X DVD. My Mac came w/ preinstalled OS X and i just upgraded via Appstore. I hope you will be able to help me! Thanks.