Could check the Win HW compatibility list for your device here: http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx
It also sounds like you have a PCI-Express card and you're plugging it into a PCI slot? Without me doing a lot of research on your hardware setup - you also might want to confirm the bus types (but I wouldn't think the actual slots would be the same thereby disallowing you from inserting a PCI-Express card into a PCI slot).
so... a couple things:
-Confirm your hardware is compatible with Windows 7.
-Confirm the bus type of your network adapter (perhaps put a full brand/model number out here for us to review?)
-Drink a brew - they must have great brew in Sweden, no?