You can get a copy of the Java Virtual Machine from their web site www.java.com, although Java VM is now bundled in with the main Java download.
If you have an older machine you may have to uninstall the Microsoft version of Java by
- Go to the advanced settings of internet options in your control panel
- You can disable Microsoft VM there
- Restart your machine
- Install the Sun Java
Once this is done exPressit and various other java applications will run without a problem on your computer.