The following table compares the features of ClickOnce deployment with Windows Installer deployment:

Feature	ClickOnce	Windows Installer
Automatic update1	Yes	Yes
Post-installation rollback2	Yes	No
Update from Web	Yes	No
Does not affect shared components or other applications	Yes	No
Security permissions granted	Grants only permissions necessary for the application (more safe)	Grants Full Trust by default (less safe)
Security permissions required	Internet or Intranet Zone (Full Trust for CD-ROM installation)	Administrator
Application and deployment manifest signing	Yes	No
Installation-time user interface	Single prompt	Multipart Wizard

shouldnt need admin permissions to install. Thats kind of the whole point. worst case scenario, you might have to tweak your internet settings or something.