Shouldn't be too serious, download Spybot Search and Destroy http://www.safer-networking.org/en/download/index.html it's free but you can make a donation if you like. Run that to get rid of the spyware.
I take it you're already running antivirus software and a firewall? If not you should be.
AVG Antivirus http://www.grisoft.com/us/us_dwnl7.php and Zone Alarm http://www.zonelabs.com/store/conten...id=zadb_zadown are both free. Run a full virus check and then you can think about getting back into chat. Microsoft no longer offers support for Java, mainly because it's free, so you'll need to get it from Sun http://www.java.com/en/download/windows_automatic.jsp will download and set up java for you. Happy chatting.

peace

p.s. Don't forget to check for updates at least once a week