Hello,

I am trying to connect my headset to my pc but it seems i got no bluetooth driver. I installed windows 7 on my iMac and i dont know wich driver i need to have. Can somebody please help me?

Check for a bluetooth diver at apple's support site

Memory space needed for the driver software is around 35 MB. So before installing the driver software you need to check the available memory space in the hard disk. Also check the connection for the Bluetooth device to your system. Invalid connection prevents the driver software installation process. You need to check whether the Bluetooth driver is compatible with Windows 7.
http://www.windows7download.com/win7-widcomm-bluetooth/amphfxne.html
http://www.windows7download.com/free-win7-bluetooth-driver/
http://windows7.iyogi.com/features/windows-7-bluetooth-software/

http://drivers.softpedia.com/get/Other-DRIVERS-TOOLS/Others/Apple-Bluetooth-Driver-10-for-Windows.shtml