detective

I have upgraded to Windows 7 ultimate but my vista drivers are not working in it so I'm not getting any graphic effects like areo etc. What should I do, from where can I get drivers, I just know that I'm using a lenovo PC. I tried using Driver detective etc. but they are paid software so no luck...

i formatted my laptop few days back & reinstalled Windows XP,installed all the drivers from DeLL website but then also my PC hangs while surfing on net otherwise it works perfectly fine.Driver detective shows that there is some problem with Broadcom 440x 10/100 integrated controller. what...