INFORMATION REQUIRED WHEN POSTING A QUESTION Provide your full system info!
1.Your win7 must have SP1 and all available updates. If your win7 doesn't update automatically - try this solution
2.Delete C:\AMD folder
If you are downloading 17.2.1 from http://support.amd.com/en-us/download/desktop?os=Windows+7+-+64 then you are installing 17.2.1, your driver version tag just isn't getting updated, which is no issue other than not seeing 17.2.1, the drivers are still 17.2.1. Also if you use Display Driver Uninstaller to do a clean install instead of the clean install option in the installer, Radeon Settings tray will fail to load most of the time.