For reasons beyond my comprehension, when I started up the creation kit this morning the cell view window has decided not to show itself. I untick and retick it in the view menu, but it still opens up off screen. This is probably a display issue but all the other windows work perfectly. Is there any way to open cells in the render window without using the cell view window? Or perhaps this has happened to someone else and they have a fix.
Any help is much appreciated and thankyou for your time.

Issue now resolved, a resolution problem due to running the p.c through a TV.

Try renaming the CK ini files and see if that fixes it. It should create new ini files with a default setting. Then you can compare the two and see what needs to be added back, and maybe what caused the problem.