I have encountered this issue on my own listed W-7 home Premium Dell, and on an acquaintances similarly equipped 2010 vintage HP lap top.I have searched the threads found here and elsewhere, but both computers cheerfully ignore any repair efforts.
Two sites that are guaranteed to have issues are Ikea and Domino's Pizza.The problem has just appeared recently. Is it a change at those sites, or a change in Java? The latest Version 7 update with patches for security issues has also been tried to no avail.
Remember folks, I know just enough about what I'm trying to do, to be dangerous.