Not sure if this issue can be resolved here or not.
Basically, I've just recently had my hard drive replaced, and this problem with Safari has only happened since then. Basically, when I'm using (or trying to use) hotmail, if I hover my mouse over something, the button will disappear (this has happened on at least one other website also). Before I had the hard disk replaced I would regularly have Safari 'quit unexpectedly' too.

Is there anything anyone can suggest that might be a cause / solution for this?

Thanks in advance.