Simply use the Adobe updater from the program.
If Premiere is not working just open any other adobe application and run the Adobe Updater. It will find that Adobe Premiere will need to be
updated. The latest version is 4.2.1. Good Luck!
- does installer say something after installation? (like installation done with some errors), if yes, post it or them.
- have you closed all antivirus applications and disconnected (obviously) LAN or telephone cable from your router or modem?
(I suggest it because sometimes is not enough closing A.V. appl. if there are automatic updates running).
- Surely do the last update: is the most reliable (4.2.1).
- follow the suggestions written by the "prevoiuses"