Sometimes you get a ‘File Security Warning’ with the message that ‘the publisher could not be verified’ when you execute an application from a shared drive. This can easly be solved by doing the following:

• Control Panel, Internet Options, Security tab, Local Intranet, Sites, Advanced
• Add \\Server\share as a website to the “zone”

Now the problem should be solved.

 To get the Security tab back in Windows XP Professional:

1. In the Control Panel, open the Folder Options applet.
2. In Folder Options, select the View tab.
3. In the Advanced settings area, scroll to the bottom of the settings list and locate Use simple file sharing (Recommended).
4. Uncheck the checkbox. 

Now you can manage the permissions on files and folders using the Security tab that magically shows up.