Unable to find the right driver

I am running Win 7 Home Premium on a AMD Athalon 64X2 Dual Core processor 6400+ 3.2 GHz with 4GB DDR2 Ram on a Gigabyte AMD Series 7 mother board. I want to hook up a usb 1.5 TB free agent HD to it and it orks fine on Vista but win 7 doesn't see it on the pc. I haven't been able to find the compatability mode to change it so it will run and Win 7 doesn't have the drivers. Some help in obtaining either one would be greatly appreciated.

 

Thanks for the reply. This is a new install of Win 7, 32 bit and I have no yellow marks in device manager. I d/l Seagates tool that checked it and said it is fine and it works great on Win Vista

 

The file you told me to get did the trick. I thank you much. I had looked for two hours the other day and didn't find that file but did fine the tool that checks the drive. Again thank you much.