Many thanks for your prompt response.
Unfortunately, even after following your advice I still get the same problem. However it does get there so much quicker.......I disconnected from the net and closed down the virus scanner but it made no difference. as soon as I hit the setup.exe file or even the installation package from the 'Winrar' application, I almost immediately got the same 1610 error response. One of the postings mentioned ( with the same problem ) that the package should not be 617Mb but something like 648Mb. I noticed that a) mine is always 617Mb and b) the date on the installation file in Winrar is June 2007.
Has anyone any other suggestions as to how or why, even after deleting every reference from the computer and registry this product still keeps coming up with this corrupt installation message?
Kevin