You may get this error message program.exe not found when you open any webpage or sometimes you may also get this error when you click on mail links. This error occurs because the registry entries might have had problems. If you have Trojan or virus, then it might have created a mess with the system registry. Try using the application after running a system scan. This problem is commonly found in the windows 98 system due to the changes in the design.
When you get this message while opening a webpage, then it means that you are using the Network Telesystems TCO pro protocol for TC/IP connections. Windows gets connected to the internet using the internet connection wizard and this protocol prevents opening the connection wizard. Opening this wizard is important because it is responsible for associating html documents with your browser. To solve the problem, try and run the internet connection wizard manually. Type inetwiz in the RUN prompt to open the wizard. Then you need to follow the steps and click ok to complete the wizard.
If you get this error while opening specific programs, then you have to edit the corresponding entries in the windows registry. You have to be careful while manipulating with the registry because you may face many problems if you don’t do that correctly. You can get support from the discussion forum where people are using similar application.