Log in as Administrator
from a command prompt:
change user /install
Install install_flash_player.exe (version 9)
change user /execute
For each of the following registry keys for Flash Player:
HKEY_CLASSES_ROOT\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000}
HKEY_CLASSES_ROOT\CLSID\{D27CDB70-AE6D-11cf-96B8-444553540000}
HKEY_CLASSES_ROOT\CLSID\{1171A62F-05D2-11D1-83FC-00A0C9089C5A}
HKEY_CLASSES_ROOT\TypeLib\{D27CDB6B-AE6D-11CF-96B8-444553540000}
1. Right-click the key, select "Permissions"
2. In the Permissions Dialog click the "Advanced" button
3. Click "Add"
4. Select "Everyone"
5. Select "Allow" for the "Read and "Full Control" permissions.