You need 1.6 update 7 installed as well as the current version.
Create a new desktop shortcut by copying the one created by SEPM. Look at its Properties and change the first part to point to the javaws.exe from 1.6 update 7.
The new shortcut properties will look something like this:
"C:\Program Files\Java\jre1.6.0_07\bin\javaws.exe" "C:\Documents and Settings\<user>\Application Data\Sun\Java\Deployment\cache\6.0\35\6e022e63-51997c15"
Do not modify the one created by SEPM. Starting with MR4, it rewrites it every time SEPM is launched so your changes will go away.
Applications launching Java, such as IE, will continue to use the latest version of 1.6 that's installed.
Ray
Mine does not rewrite the symantec shortcut after I altered it. I think some don't know you can have more than one version of java. Just like Ray said make sure your shortcut is pointing to the correct version of java folder, ie. "C:\Program Files\Java\jre1.6.0_07\bin\javaws.exe"