Thank you - I only did it because the system was getting slower and slower. That's why I go into the normal recycle centre - not ebay, to get rid of a load of unwanted stuff and then defragment. It still runs slow, but the tower is nearly twelve years old.so it's living on borrowed time anyway.
The other thing I wanted to know is how do I delete long sold items off the "Sell an item" system? When I press "Add photos", all the old stuff is still there.