As suggested by Fruit Bat I opened Vista with F8 Advanced Boot Option and selected "Disable Driver Signature Enforcement". However, the Talk Talk CD still will not install and the same error message occurs.
With regard to the other helpful suggestions, I have looked at the Talk Talk FAQ but I cannot find that it deals with this particular problem. If anyone has found it, please give me the link to the particular page.
baldydave suggests right clicking and choosing run as administrator. I have tried right clicking but there is no option to run as administrator.
Btw, SP1 has NOT been installed on this laptop!
Any other suggestions of what I can try would be welcome!