For the Rainmeter Grayhound Skin to work you need to install two products.
HWiINFO is a popular, free and amazingly detailed hardware information tool for Windows. It digs deep into the guts of your system and extracts all the details it can find. A natural choice and source for Rainmeter skins. I wish the Rainmeter team would support and document it better. Thanks to other Rainmeter skin developers it has been proven as a suitable Rainmeter metering source.
Download and install Rainmeter. Select to have it start with Windows.
Start Rainmeter manually or restart Windows.
Download the Grayhound Skin from here:
Unzip the file and in it you will find an *.rmskin file. Double-click it. Rainmeter will open the file and install it for you.