You may have to copy over msvcr71.dll from C:\Program Files\Java\jre6\bin\
to the C:\Windows\System32\ directory. This was necessary for Opera 10a to use Java.
I am in XP for the moment, so the directory names might be slightly different, but you should be able to figure it out. I believe you need to have hidden files viewable from Folder properties in Control Panel. I also suggest not having the file extension hidden.
If you are using 64-bit Win7b, there may be other issues.