Ive managed to root my H8 galaxy on win 7 rtm x64 very easily using this guide.
http://www.androidworld.it/wiki/Root_Samsung_Galaxy_(ENG)
all i did was whilst installing the driver from the sdk was to pick the adb test interface rather than peeing about trying to edit inf files etc. then i copied those files in the folder like the guide says and put update zip on the sd card and opened a cmd window in the sdk tools folder with shift right click and typed the commands from the guide and it worked.
by far the best guide for a numpty like me who struggles to dress himself in the morning, let alone rooting gadgetry!
hope it helps someone!
http://www.androidworld.it/wiki/Root_Samsung_Galaxy_(ENG)
all i did was whilst installing the driver from the sdk was to pick the adb test interface rather than peeing about trying to edit inf files etc. then i copied those files in the folder like the guide says and put update zip on the sd card and opened a cmd window in the sdk tools folder with shift right click and typed the commands from the guide and it worked.
by far the best guide for a numpty like me who struggles to dress himself in the morning, let alone rooting gadgetry!
hope it helps someone!

im not sure if its a 100% yet though cos i cant get nandroid backups to work. It just says meic is missing! but my apps are definately root now and I'm happily playing with bits and bobs.