There was an error opening this document. The file is damaged and could not be repaired.

Hi I constantly get the following message when trying to read files:
There was an error opening this document. The file is damaged and could not be repaired. I am using Windows XP.

I tried uninstalling the program and reinstalling but this didn't work. I also tried repairing the installation - still no joy.

I would be grateful for any help.
Tess