Virus Protection

Check the manual. It should tell you what you need to do.

Without more information, it is impossible to help you.
What is the program? What OS are you using? Why did you buy something so antiquated that it requires you to enter the drive letter?

It seems that the 'autoload' function for cd's has been turned off on your PC (assuming you don't have a MAC).

Put your CD into the CD reader.
If you have a PC, click on start, then 'My Computer' or 'computer'.
This opens windows explorer or a dialog box for you to choose which disc to explore with the system file manager.
Your CD is usually an icon which looks like a CD - select this disc drive.
You should now see all the files which are available on your CD.

Normally, to start the installation of software onto your computer you double click on the file named 'setup.exe'.
Alternatively, read any help files shown on the disc eg., *.txt, *.hlp, *.chm. (* simply means anyfilename)

rhymer--
Thank you.

I followed your instructions as follows:

I clicked "My Computer." A menu appeared including what appears to be an icon for a CD and the text CD-RW Drive (E. I believe that this refers to a rewritable CD and that the disc in question is a non-rewritable DVD.

Thus I conclude my problem is that I don't have the proper drive to upload the code.

Perhaps there is a way to obtain the code directly from the vendor's site though I haven't been able to find the way and there is no "Contact Us" on the site.

DVDs don't work in CD drives.

DVD drives are fairly cheap ($25) and it might be easier to just upgrade your drive to a DVD drive.

Turn off and unplug your computer. Open it up, then 4 screws and 2 cables later, you should have a new DVD drive ready to run your software.