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The 'Driver Installer' lets you install any driver either from driver packs or you just have an updated driver to the computer currently installed (Live).
Installing Drivers

Step 1: Select the folder your drivers are in
Use the 'Add Drivers' to select the folder which contains your drivers *.inf files
Note: *.inf files with the same MD5 will not be added, this avoids installing the same driver.
Step 2: Click Start
Once your files have been added, click 'Start' and W7T will start installing the drivers on your computer.
Step 3: Wait
Wait may take some time to install all the drivers, so go for coffee, cup of tea or whatever you prefer. W7T will let you know when it's done.
Uninstalling Drivers

Step 1: Press the scan button
This will check which drivers are already installed via on your live system.
Step 2: Select the drivers you want to remove
Tick the boxes next to the drivers your want to remove.
Step 3: Press 'Uninstall' and wait
Now all you have to do is sit back and wait for those obsolete drivers to be removed, W7T will update the list once completed.