Very strange, annoying and lasting problem with CC Desktop update (Windows)

Hi,

Each time CC Desktop is updated on my main system, the following occurs :

- The package is downloaded and the instalation starts.

- I get a message saying the the program will restart after installation.

- The installer terminates, its window closes and nothing more ever happens. No restart. No error message.

- When I look at the Program Files\Adobe folder, I can see that a new folder has ben created, containing the new version. It is named Adobe Creative Cloud + version number. 

- The folder of the previous version (Program Files\Adobe Creative Cloud) still exists. It is never deletd and the folder for the new version is never renamed.

End of game.  I have to delete the old folder myself (after terminating all Adobe processes) and rename the new folder correctly.

No such problem on my laptop. CC Desktop restarts as expecetd after the installation and the old folder is automatically deleted. This laptop is connected to the same network and runs Adobe software under the same account. I can see any system setting that could be different and cause the problem described above.

Strangely enough, the installation on my main PC is much, much slower than on my laptop.

Any idea will be welcome.

Thanks in advance.