Your not the only one, I got this error after cleaning up un-needed files in my windows directory. Before anybody tells me what a silly boy I am I'd just like to point out that it was the 'cookies' 'favorites' and 'temporary internet files' directories that I deleted, and I don't use IE (I've never installed, having disabled it in Windows 95 setup)

I use Opera 5.12 as my browser and the Java distro that comes with it.