This error occurs in Windows Vista when User Account Control (UAC) is turned off. To fix it, turn on UAC by following these steps:
1. Click the Start button, then click the Control Panel link.
2. Under the "User Accounts" category, click the "Turn User Account Control (UAC) on or off" link.
3. Click in the empty checkbox labelled "Use User Account Control (UAC) to help protect your computer".
4. Click the OK button. (You may be required to restart your computer.)
5. Relaunch the software.