For Java:
Do I have Java? - http://www.java.com/en/download/installed.jsp?detect=jre&try=1
Test whether Java is working - http://www.java.com/en/download/help/testvm.xml
Java for Windows - Firefox/Mozilla - http://www.java.com/en/download/windows_xpi.jsp?locale=en&host=www.java.com:80
Java Downloads for All Operating Systems - http://www.java.com/en/download/manual.jsp
Can I remove the older versions and do I need multiple versions of Java installed on my system? - http://www.java.com/en/download/faq/remove_olderversions.xml
General Questions (FAQs) - http://www.java.com/en/download/faq/index_general.xml
Error Messages - http://www.java.com/en/download/help/index_error.xml
Old Version of Java: http://www.oldapps.com/java.php
You can obtain the older versions of Java and related documentation from the link below - Archive Java Technology Products Download: http://java.sun.com/products/archive/
Re: Error 25099: Unzipping core files failed: Make sure the %ProgramFiles%\Java\jre6\ and %APPDATA%\Sun\Java\jre1.6.0_10\ directories are empty. Are any of the Java files still in use? (Kill jqs.exe in Windows Task Manager) Try rebooting or using ProcessExplorer to find files that are still running out of the jre6 directory.
Ron