I had that runtime error awhile back, I got rid of it with a fresh JAVA install.
My Firefox browser didn't like the JAVA site and it wouldn't download from there,but I did manage to get the download using Internet explorer.
If you have trouble Navigating Sun's site or getting the download,post here and I could upload the file to filefront for you.
Edit>I uploaded the file to filefront for you, there's a zip there named Onlinelivesetup.zip
It's Sun Java's runtime enviroment online setup.
SunJava Online SetUp Runtime Zip
This is a link to an earlier thread when I had runtime error hassles
My Runtime Trouble
I had problems re-installing a few things like Mission mate as well as QMT,installing the Java runtime enviroment fixed it.
Thanks to MaXMhZ who posted the file as well,in the earlier thread.