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Click Start, click Run, type “regedit” in the Open box, and then click OK.
In the left pane, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionInstaller

On the Edit menu, click “Permissions”.
In the “Permissions for Installer” dialog box, consider the “Administrators” and the “Users” in the “Group or user names” list.
Make sure that the Full Control permission is set for the “Administrators” and the “Users” group.
If this permission is not set, click to select the Full Control check box under “Allow”.
Click “OK”.