Windows cannot access the specified device, path or file

I've been using various PortableApps from my C drive without any issue for a long time now. Installing them into a dedicated folder was never a problem.

I've been trying to install the PortableApps Platform but, as soon as I start the installer, I get an error message:

"Windows cannot access the specified device, path or file"

Since I haven't even had the chance to specify anything, I don't know what it's complaining about.

Any idea?

Thanks!

Raph