Thanks guys, I was working round to it could be memory, never thought it could be hard drive size. (The network drive it is booting from is 14Tb) Although the other machines boot from the same drive, and don't show the same symptoms. Which indicates more memory size.
Anyway overnight I rigged a 64bit boot together for this machine, and this is so a whole magnitude faster. (As you would expect)
Next I'm going to try and make the home folder a link to the 32bit home folder, and hope it doesn't smash anything up. That way they should look the same, but be the relevant 32/64 bit.
Last edited by dragonfly-uk; 04-17-2013 at 04:42 AM.