If you're running a 32-bit operating system and are using an Nvidia GPU you better start thinking about upgrading to 64-bit if you want to continue to get game ready drivers. Yes, you read that correctly. Nvidia will no longer provide drivers for 32-bit operating systems after the 390 driver release. Not surprising. Existing drivers will probably keep extreme legacy programs on older operating systems going for another 10 years or so. That should be adequate. And new games usually require more than 4GB ram (32 bit OS limit), so I don't see a problem with this.
End of NVIDIA Driver Support for 32-bit Operating Systems
Answer ID 4604 Updated 12/21/2017 04:23 PM
WHEN IS THE NVIDIA DRIVER ENDING SUPPORT FOR 32-BIT OPERATING SYSTEMS?
After Release 390, NVIDIA will no longer release drivers for 32-bit operating systems1 for any GPU architecture. Later driver release versions will not operate, nor install, on 32-bit operating systems. Driver enhancements, driver optimizations, and operating system features in driver versions after Release 390 will not be incorporated back into Release 390 or earlier versions. This impacts the following operating systems:
Microsoft Windows 7
Microsoft Windows 8/8.1
Microsoft Windows 10
NVIDIA intends to support critical driver security fixes until January 2019.