1. some time this error is generated we remove the hardware key without closing the file or installation.
Please remove the hardware key before the installation then restart the system & insert key.
it will be work properly.
2. or follows this instructions
Installation
We recommend that you exit all Windows programs before running the setup
program. To install OptiSystem, perform the following procedure.
Step Action
1 Log on as the Administrator, or log onto an account with Administrator
privileges.
2 Insert the OptiSystem CD into your CD ROM drive.
3 On the Taskbar, click Start and select Run.
The Run dialog box appears.
4 In the Run dialog box, type F:\setup.exe, where F is your CD ROM drive
Note: If the software was provided in electronic (downloaded) format, double
click on the “setup.exe” file in the software installation folder.
5 Click OK and follow the screen instructions and prompts.
6 When the installation is complete, reboot your computer.
Note: OptiSystem samples are no longer automatically installed during
installation. To install the OptiSystem samples folder right-click and open (or
double-click) on the “OptiSystem_Samples.exe” file within the OptiSystem
installation folder.