Problem uninstalling and installing Java on new pc running Windows 7 64 bit os.

I have a new Dell Studio XPS running Windows 7 64 bit os. I am attending online classes which require IE 8 and Java version 6 build 20. The pc came with IE 8 32 bit and Java 6 build 21 already installed. I tried to uninstall Java using add and remove programs but after about 45 minutes of "Preparing to remove application" I got an error refering to a missing dll file and the uninstall failed. I used a third party program to remove Java and downloaded Java 6 build 20.

My problem is when I try to install it I get the box telling me "Installing program ... this may take a few minutes" however after 30 to 45 minutes nothing has happend and there is no indication in the progress bar that anything is happening then all of a sudden the program bar is full and the program is supposedly installed. When I try to run it however it doesn't work. Someone help please! I can't get access to my classwork with out this!

Thanks

From superuser

• Try using Revo Uninstaller Freeware to uninstall Java.

  Some more advice : Disable any anti-spyware or anti-virus software on your system during the installation. Always execute installations using "Run as Administrator" or disable UAC during the installation.

  See the following links:

  Error 1721: There is a problem with this Windows Installer Package
  Why is Java not found on x64 Windows Vista after installation?