1. Disable any anti-spyware programs you have running if you run into the 1721 error during installation. This error occurs when a security tool interferes with the installer package. Disabling an anti-spyware program varies depending on the program, but can generally be performed by right-clicking the security tool's icon on the system tray and clicking 'Disable.'
2. Delete the contents of the Java 'jre' folder if you run into the 25099 installation error. Access this folder by clicking the Windows 'Start' button, 'My Computer,' double-clicking the 'C:' drive and double-clicking the 'Program Files' folder.

3. Double-click the 'Java' and double-click the 'jre' folder. Delete the contents of this folder. Try installing Java again (see Resources).
4. Check your Internet connection if you run into the 403 error. This error mostly occurs if the network fails during installation, and Java loses access to the download server and stops in the middle of installation.
5. Download Java offline you are still running into problems (see Resources). Run the setup to install Java. Close and relaunch your Web browser when the installation is complete.
6. Enable the Java console. Do so by clicking the Windows 'Start' button, selecting the 'Control Panel' and double-clicking the Java icon.
7. Click the 'Advanced' tab and click the ' ' sign next to Java Console. Place a check on the 'Show Console' radio button and click 'Apply.'