Ok so I tryed classic today earlier with FireFox and it worked fine... I had caught a virus and restored my system, but I do not think it did anything... but now when I go to play it says "switching applet" and goes black for a long time and never changes. I have the newest version of Java, using Vista, and Mozilla Firefox, I tried it with Google Chrome and it still didn't work, I reinstalled Java, no luck. Is there a limit on plays or anything? I really want to play again because I was just getting into it and was considering buying it.
a lot of people seem to be having this issue, and it isn't just classic, the premium version hasn't worked for me for nearly a month now, both browser and the downloaded .exe. I contacted the java manufacturers and they've informed me that it has nothing to do with their end, the game needs to be patched, though it works on my mum's laptop which has the same version of java as me, so not quite sure what is causing the error at this point.
I found the solution. Delete the .minecraft folder on your pc. Just trying to help, because I no longer play classic.