"Unable to complete operation due to failure renaming temp file. Temp file remains."

Continue running executable?

- is an error Im getting anytime I wait (ie autosave)

I think its because I just tried a few mods, didnt like them so deleted my MW directory and pasted a backup I made just before installing the mods. Any idea how to fix this?

Edit... fixed it, seems it was down to UAC.

Is there a way of moving my MW directory from program files into a non-admin protected area of my PC?

Yes, drag and drop it.

Great I'll try that..

Also how do I clean a mod before using it?

I think you should know this since it's important for a stable game, because if you see this in-game while saving (usually by pressing F5 for Quicksave) then check your gamesaves in the Morrowind\Saves folder and if there are more than 500 gamesaves then backup all unnecessary files so you'll have less than 350 and detele the rest.

"Unable to complete operation due to failure renaming temp file. Temp file remains."

You'll want to clean it for bad GMSTs first.
Many tools can do this for you. TESTool, Escog, EE, Tes3cmd, etc. Just use the one you're familiar with.
(Some mods should not have their GMSTs cleaned, although this is rare, and the info to not clean should be in the ReadMe file.)

I always check a mod for dirty references in the CS before using it. And then remove them with EE if they are going to cause problems. Unless you know exactly what to look for, this won't make any sense to you
It's also not needed very often. Especially with popular mods that are well established and trusted.

Instead, you can run Mlox on your Load Order, and it will often warn you of a mod that has known problems. (but it doesn't clean mods for you)

The GMSTs are the most common problem, so you definitely need to learn how to clean them out.

Im having trouble installing tes3cmd..

From the Fliggerty help page..

"Yeah, ok. It's easy, you throw the Tes3CMD into the data files folder, you right click on your Data Files folder while holding shift, open command window, and type "Tes3cmd fixit" (do NOT type the quotes in the cmd window) and all your mods will be cleaned. IIRC, it worked for me"

When I try this I get the following message...

data/dumper.pm did not return a true value at script/tes3cmd line 104. Begin failed-compilation aborted at script tes3cmd line 104.

I've always wonder how in earth do I do such thing open a mod in CS and then looking for dirty refs. Where can I find the command/option for this feature? How do I do that?

In the CS, in the list of mods, click on the mod and hit 'Details'. This shows all the things changed by that particular mod. So, if that list contains things which you didn't want to edit, you can delete it by selecting it and hitting 'Delete'.

Good to know. Thanks mate.