1. Click the 'Start' button. Click 'My Computer' if you are running Windows XP. Type 'start explorer' in the Search field if you are running Vista or Windows 7. Click 'Enter.'
2. Open the following folder path:C (or the drive letter corresponding to your hard drive) > Windows > System32

3. Download the msi.dll to your desktop (see Resource). Drag the file to the open System32 folder. Confirm the replacement of the corrupt msi.dll file.
4. Press 'R' the Windows key.
5. Type the following in the dialog box:regsvr32 msi.dll
6. Click 'OK' to register the file.