First, access an elevated command prompt, to do this:
1. Click the Start button.
2. Click All Programs.
3. Go into Accessories.
4. Right-click on Command Prompt.
5. Select Run as administrator.
6. When the UAC Prompt appears, click Continue.
Once you have your elevated command prompt, input the following:
using the desired locations to fill the above mentioned filepaths.
(Example: msiexec /a c:\testfile.msi /qb TARGETDIR=c:\temp\test)
Press the Enter button on your keyboard.
If you have entered the command correctly, the MSI file's contents will be extracted.