How to Deal With Setup Error - The MSI Must Be Launched From Setup

C: Program FilesSymantec
C: Program FilesNorton
C: Documents and SettingsAll UsersApplication DataNorton
C: Documents and SettingsAll UsersApplication DataSymantec
C: WINDOWSsystem32driversNAV
C: WINDOWSsystem32driversNIS

(Note: Application Data in them hidden)

2 Clear the entries in the Norton product in the Registry Editor. Get Norton 360 on primjer.Sljedeće registry information left it in the Registry Editor when it is installed on your computer.

HKEY_LOCAL_MACHINE \ Symantec
HKEY_LOCAL_MACHINE \ Symantec Technical Support
HKEY_CURRENT_USER / \ Symantec

Finally, after you complete the two steps above to return to the Program Files Documents and Settings windows C drive to make sure that you have files in Norton product is still there. If so, delete them manually. Or, if you can not take the risk of cleaning the registry information in the Norton Registry Editor which would adversely affect the system from the ground up and can not recover compensation cost or expensive repairs.