Did you manage to get Hamachi to work on 7 windows? It's amazing. Write in more detail how you managed to do this. I think you may not always be able to respond promptly to a personal message. So your solution to this problem will be better formulated in the public domain, so that other players can use your instructions if necessary. Personally, this problem is irrelevant to me. However, I know that quite a lot of players currently still use 7 windows. This will be useful information for them.
As I said, my problem was the Hamachi Network Interface that could not be installed. It means that I was able to install Hamachi, create a net, let ppl join my net, even chat with them but, the network interface could not be installed and that was the problem. The network interface is the tool that allows the communication between devices (as your wifi card or the LAN card for example).
Basically I saw this small yellow triangle with exlamation point next to the user in Hamachi. Well, that is the problem. So I went on "Systems" under windows control panel and there I saw the Hamachi Network Interface present but with a driver problem (again this yellow triangle).
Now, if you try to update this driver, in 99% of the case, it will tell you that it is not possible, because Windows 7 makes a certificate check on the driver (Error 52), in most of the case this check is not passed and the driver cannot be installed/updated, so Hamachi won't work properly.
The solution is behind installing a particular windows update, Windows6.1-KB3033929-x64, (you do not get it if windows updates system is disabled as was mine).
So, I downloaded from inetrnet this update only (I did not want to download 2GB of Win7 updates which I hate), I installed it and then I re-installed Hamachi et voilà!
The Hamachi Network Interface get installed correctly and everything worked as It should.
Another tip, is to check under "connection and sharing center" (I do not know exaclty in english) under the control panel. There you will see all the network card you have installed (wifi, LAN for example) and Hamachi also which is virtual but is always a network card. However when you can't install its interface you won't see "Hamachi" under this page, but when you manage to install it correctly, so you will.