You can not install Memjog program on your desktop computer. Your using Windows XP, and are using Firefox. Also, you need a desktop icon for Memjog.
I tried going to Memjog.net to try to find some support, but that website is no longer functional. I assume this is a web site you are trying to download and install software from? Are you trying to use their free version or paid version?
Make sure you are logged into that computer with administrator rights. You can right click on an installation file for Memjog and select "Run as administrator". Enter your administrator password.
If you no longer have that program on your computer, you can download it from this Memjog SourceForge page. Once that file is downloaded to your desktop, double click it to start an installation. If it will not install, right click that file and ten select "Run as administrator" and enter your administrator password.
Also, if you accidentally removed that program from your computer recently you can try to perform a Windows XP system restore to a date before you removed that software. Click "Start", point to "All Programs", point to "Accessories", point to "System Tools", and then click "System Restore". On a Welcome screen, click "Restore my computer to an earlier time", and then click "Next".
On a "Select a Restore Point" page, select a date from a calendar that shows a point you'd like to restore to, and then click "Next".