The error message indicates that CC4 is not able to access the folder where the content is to be installed.
Did you install to the default content folders or did you choose a custom location? If you chose a custom drive/folder option, where did you choose to install the content?
One other thing to check is that you are logged into your computer with an Administrator account. If you are not an Admin then that could account for the problems accessing the content folders. You can check if you are using an Admin account or just a User account in Start > Settings > Accounts.
Peter
Forum Administrator
www.reallusion.com