You need to check the following:
Close TOPAZ,
Delete TMPTopaz folder
Check the access rights and if the user you are logged in as, has full control over the Datatex folder
Navigate to C:\Program Files and right click on the Datatex folder and choose Properties
Untick read only and apply the changes to this folder, subfolders and files.
Open TOPAZ
You should now be able to enter the Company details.