Make a backup of the Current System Registry

It's very important that before you do editing you make a backup of the current registry. For Open your  registry.

Go to Start>
Run & type regedit .
When you invoke the Export function from File>Export
Then save your Backup File.

Each one of the different file types above plays an important role in how the data you export is saved. Choosing the wrong type can give you unexpected results. So let me explain you quickly these file types.