Oh dear!
This new piece of information, together with the 100% CPU usage that you initially reported, strongly suggests to me that you've allowed 'nasties' to invade your PC which are badly affecting your machine's performance. You should head over to our 'Security' forum section and start off by following the relevent advice about cleaning things which is contained in the article:
Helping yourself: What to do first
I've no idea, really, exactly what the malware is which would be causing the behaviour, but you can be sure there's some in there! And a word of explanation:
JAVA is a scripting language - it's not a 'THING' in itself you've downloaded. JAVA is one of the languages used by Web applications in particular, and your Web Browser uses it often. It's most likely, I'd suspect, that the little 'nasty' that you've ended up with is a 'Dialler' which is trying to use your modem to generate income for itself with (possibly ISDN) 'pay per minute' phone calls. As most dial-up modems contain audio circuitry as well, this would explain why it's playing merry hell with your system's audio functions. (And if you haven't actually GOT an internal data/voice/fax modem in there, that'd be even MORE explanation why it's playing havoc.
You don't, ever HAVE to download and install things like this. In fact, when you click on something to try and download it, and get one of these messages, it's time to say "NO: I don't HAVE to have that download after all!"
Please clean your system of 'Net nasties' first, and then let us know if you have remaining problems afterwards.