Try this..
For Vista (32 bit):
- Open Computer.
- Navigate to C:WindowsSystem32.
- Scroll down and open the Macromed directory.
- Open the Flash directory.
- Right-click FlashUtil9b.
- Select Run as Administrator.
- When the UAC prompt appears, select Continue.
- Follow the Flash Player installation wizard.
For Vista (64 bit):
- Open Computer.
- Navigate to C:WindowsSysWOW64.
- Scroll down and open the Macromed directory.
- Open the Flash directory.
- Right-click FlashUtil9b.
- Select Run as Administrator.
- When the UAC prompt appears, select Continue.
- Follow the Flash Player installation wizard.
Enjoy!