The file gwx_control_panel.exe can be downloaded from the link above. It's a good experience to check the file for malware. So, use your antivirus program or try a free one – Dr.Web CureIt.
Download the 4.4 MB and start the installation by clicking on the file and following the steps of the setup process.
You can easily uninstall GWX Control Panel. Click the Control Panel and choose the program you need to remove. Click on Uninstall to delete it.