Update to previous problem
Ok, I have now tried deleting all apps downloaded from android market except for a task killer. Didn't change anything.
Have looked at my device manager - in usb its showing as connected and working, but in portable devices its saying that the phone ' cannot connect - error 10'. Gave up and installed kies to boyfriends computer-runs vista ultimate 64 bit. Every time you plug phone in it installs device and mtf drivers successfully - but phone still doesn't recognise in kies or as mass storage. Just shows as generic in device manager and still can't access phone anywhere. Did trouble shooter finally thru samsung web site and its saying to take it to service centre, it may have faulty board. Beyond ready to cry, ready to scream.
Any other advice? I just want to sync my contacts! I can do rest via bluetooth.