Apparently it does not have any causal relationship (unless the USB was containing some virus alongwith Google Chrome; but saying it will be a very very wild guess).

Whatever, it is not working,...

You can install either 32 bit or 64 bit and activate it using the windows license. If you have more than 4 GBs of RAM, you should install 64 bit.

A clean install does not install anything other...

Is the computer not booting up? The post gives that meaning to me.
Well, you can do a clean reinstall anytime, but before that better you try to revive the present installation.

Get a windows...