QUOTE(visitor @ Sep 21 2009, 04:25 PM)

It usually helps to give the complete pathway, but:
If you executed the installer directly from the browser download, try saving it to disk before installing.
If you saved it to disk first, try executing directly from the browser download.
I know it sounds crazy, but there have been posts here where it worked both ways, LOL.
Thanks for the suggestion. Unfortunately when I tried this but it did not make any difference. An identical error message appeared. I have previously installed this program om my PC (Vista) and another laptop (XP) and all went smoothly, so I'm not sure what is going on!