[Dabhand16]

I've just checked my task manager and there are about 2.5 pages of tasks running!

I'm no computer expert, but often these sort of problems are due to a lack of availabe RAM, but this is usually cured by a re-start.

I googled 'ps will not open tif files' and came up with this:

A long shot: when you have large files in big directories it can take a long time for the operating system to assimilate all the information. You have to watch the hard drive light in your computer (assuming there is one, and if it indicates activity, you just have to wait, In XP pro there is no indication that the operating system is trying to read the files when you have a large directory but the key is the hard drive light. You may have to wait a long while before the files open. PS also requires lots of RAM and you may have a RAM problem as well.

Googling 'ps will not open files' came up with

This may be due to a corrupt preferences file. You may choose to either delete the Preferences in C:\Documents And Settings\YOURUSERNAME\Application Data\Adobe\Photoshop\VERSIONNUMBER\Adobe Photoshop VERSIONNUMBER Settings\, or the easier way would be to hold down SHIFT+CTRL+ALT immediately as soon as Photoshop begins to load. You will then be prompted if you want to delete your preferences file. Click Yes and Photoshop will work again.

I'd be inclined to save the preferences before you deleted it.

It is probably worth doing your own google search and see if any other members have other ideas.

Just an after thought. Your new camera has larger file sizes than the old one. It just might be that the bigger files are soaking up your processing power and RAM. In future try processing smaller batches. I'm assuming you have been doing your housework and defragging the HDD and deleting temp files etc.

Good luck.