I don't know what you may have done to NS4.8, or whichever communicator you have, but I would open that folder, if the computer allows you, and, look for a file called unwise.exe. It may or may not help, since you don't have the item listed in the Add/Remove, but it is worth a shot.
Then, we are going to attend to the other matter. aside from the fact that it is not good to install 7.2 on top of 7.1, you will be told that not even NS7.2 is suitable, any more. If you don't want to mess with downloads or whatever, do the following: 1. go to Program Files|Common Files|mozilla.org|GRE, and see what you have there. If you have only Netscape7.2 installed, you should have only one folder, with a long number, but starting with 1.7.2... That one is NS7.2's. If you have also a 1.4.... folder, it belongs to NS7.1, and may have not been removed, and should be deleted. So, next, we address our attention to the program. It can be uninstalled, if you have it listed in the Add/Remove. When I did this, I copied and pasted the plugins folder (your fifth file is a plugin, for Flash}, and then deleted the entire Netscape6 folder.
Now, you will need the download file. If you have it, great. Just open it, and you will be directed to install 7.2, in a Program Files|Netscape folder, and it is good to select that a subfolder be created within the original Netscape folder. Call it what you want. The new installation will pick up the same profile which you had before. Make sure that your preferences indicate that it is default, and see what happens. You should have a good installation of 7.2, although I don't know about 4.8.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7 (ax)