Hi, Jjmancini
As I can see, vanillahd is back, I hope now you feel better.
As for the other websites, I can give you these advices:
This appears to be a permissions or password problem here.
So, you can try resetting permissions for this specific domain, you should go to Plesk -> Domains -> check the domains that have the problem, then click the "check permissions" button on top of the list. On the next page be sure to uncheck the "check-only mode" checkbox.
The other possible reason is the lost password for the anonymous user. To check ths one, you should run the following command line on your server:
"%plesk_bin%\websrvmng" --update-anon-passowrd --vhost-name=<domain-name>, just like
http://kb.swsoft.com/article_156_976_en.html
Finally, the reason of the issue might be the permissions problem for ColdFusion extensions. If the password prompt pops up for all websites that use ColdFusion, you should go to C:\CFusionMX\runtime\lib\wsconfig\ and set run/execute permisions for the psacln group for the whole folder.
It might be possible, that you should set "write" permissions for his folder, check your website and then get it back to read/execute (CF might need to create some logs).
I hope, this will help you get your sites up and running. good luck!