jake Hi.
java could do with updating, do that first, TalkTalk may be an issue.
Now! Go to,
START/Set Program Access/Change or Remove Programs,
now completely remove all versions of java.
Now! Use this Link to get JRE 6 u1 Use the off line installer NOT the (recommended) one,
http://java.sun.com/javase/downloads/index.jsp
Disconnect from internet, close ALL apps n reinstall java.
Shout if that dont fix things.