Hmm well if the QT doesn't do it, reinstall Java 1.4.2
http://www.apple.com/downloads/macos...update142.html & again, if it won't let you reinstall it, remove the 1.4.2updatex from the Receipts folder. Normally you shouldn't remove files from receipts as the system requires them.
Also try doing a SAFE boot & repairing permissions;
SAFE Boot & Repair Permissions