1. Shut off any anti-spyware programs running on your computer. If you are running Windows Defender, right-click its icon on the task bar and click 'Shut down Microsoft Antispyware.' Refer to the manufacturer's documentation to shut down other anti-spyware programs on your computer.
2. Try downloading and running Windows Live Messenger again. Move to the next step to clean your hard disk if you are still running into the 1603 error.

3. Click the Windows 'Start' button and click the 'Control Panel.' Click 'Performance and Maintenance' and click 'Free Up Space on Your Hard Disk.' This launches the Disk Cleanup utility.
4. Place a check on the following categories on the disk tab: 'Downloaded Program Files,' 'Temporary Internet Files,' 'Temporary Files,' 'Temporary Offline Files,' 'Offline Files.' Click 'OK' to delete unnecessary files from those locations and click 'Yes' to begin the disk cleanup.
5. Try performing the installation again.