Thanks Phil.  I put it down to 5 but sadly it is still the same :(  I have 4 gb ram.  The weird thing is it works fine on another identical set up! 

Oh and another thing... When you delete and it locks, the hard drive working light flickers as if something is happening, but I left it for 2 hours earlier and it never actually unlocks.

"I am extraordinarily patient, provided I get my own way in the end" - Margaret Thatcher 1989