Default Java Problems

Well today when i turned my computer on to play my favorite MMORPG runescape my comp was delaying a little bit AkA Lagging so i restarted it and upon restart a box appeared that said something about not being able to unpack java? well i clicked it and it popped up over and over about 10 times and finally went to the desktop and then i went to play runescape which is ran on java and when it went to load the game nothing happened just a white screen so i had to use my sun java to play and it is 10 times more laggy then normal java so id like to be able to fix this...PLEASE ANY SUGGESTIONS!?

Windows XP professional, amd athelon 800 mhz processor,192 ram,nvidia vanta 8mb video card.

Which version is your sun java?

You can find this (amongst other places) in the add-remove programs part of Windows.
It'll be listed as "Java 2 Runtime Enviroment, SE ########"
So if you could post that, it'd be nice...

Your system should actually run better with Suns JVM than MS' old JVM, as the latter is horribly outdated...

So, if the number you found for your java version is older than 1.4.2_06, you can try uninstalling it, then downloading the latest version from here (http://www.java.com/en/download/manual.jsp)...
If you have two or more versions installed, please say so, and I'll try to guide you through how to select which version to use...