I am sorry I should have been more specific.
The first problem I had, which seems to be intermittent was that my bookmark toolbar would fail to appear.
It would only appear if I clicked on 'View' and then 'toolbars' un-tick 'bookmark tool bar', and then re-tick it, my toolbar would then re-appear with all my bookmark icons.
This problem seems to have settled down in the last few days, but I now get the following message every time I switch on my computer:
V Protect Application has encountered a problem and needs to close. I then get the opportunity to either send a report to Microsoft or not to, I click 'no' and the window goes away and my computer seems to function ok.
This problem still exists.
Another problem I experienced was that from time to time firefox would need to close, and I could restart it in the condition it was in before it crashed, meaning it would save all my work etc.
This problem also seems to have stopped.
Life was much easier with the older version.