The 32bit requirement appears to only apply to the manufacturer's software, which is almost always unnecessary and/or insufficient for what you want it to do.
The drive itself should function fine without any special downloads. You might check Seagate for an updated firmware, but that is about it.
Try this to remove any drivers
that may or may not have been correctly installed by the Seagate software package:
- With the drive not connected, open an admin command prompt (start -> type cmd -> right click the cmd.exe and select 'run as admin')
- In the command window type: set devmgr_show_nonpresent_devices=1
- then type: devmgmt.msc
This will open device manager. Go to View-> Show Hidden Devices. Now go down to the Disk drives section and you should see a grayed out entry for your USB drive (it may just say USB Device, or something generic.) Feel free to uninstall all these grayed out entries (and for good measure go down to the USB controllers section and do the same.)
If you have other USB devices connected, like a thumb drive, they will NOT be grayed out, so as long as you only uninstall the grayed out entries you should be good.
Then reboot and plug in your drive, let the OS install drivers, and maybe do a Windows Update. But don't bother with the Seagate software.
You may want to do a fresh format of the drive as well.
If you still have issues with your drive after that then it may be damaged or defective.