I have a window on my desktop saying"Windows Desktop Search has detected a problem with your desktop Index and cannot continue. Please reinstall MSN Search Tool bar here: htt://toolbar.msn.co.uk. Does this mean I just have to go on the net and type the htt message in? Sorry to be a pest, I'm just afraid of making a mistake.
Uninstall the existing version, then install your download. Which you should have saved, by the way, not run. If you run a downloaded executable file, it won't be saved anyplace and if you need it again, you'll have to download it again.
No, that means that you have saved it. Now you need to double-click on the file to install it. Then I suggest that you create a folder somewhere for all such software downloads - AVG, etc. - so that you always have them available.
This is straightforward and I've explained as clearly as possible.
What are you doing in Program Files?
I said "go to wherever you chose to save the download and double-click to run it".
I aslo pointed out that it's a good idea to have a folder for storing downloaded programs. I keep the original downloads of all my programs because you never know when you might want to re-install them or pass them on to someone else.