You can't use CCleaner to do anything to a network or a printer, it is a Windows only application.
So they may have used it to clean all the computers on the network, but nothing was done to the printer with it.
So the printer can't reach out to Xerox, so that would be a problem with Gateway/DNS settings, or due to a Firewall install or change.
So verify the printer is actually on the LAN, go to it, get it's IP address it displays, then go back to your computer and verify you can reach the copier from your PC via the IP address (type it into your web browser address bar)
If you can't, you should compare the IP of the printer, with the IP of your PC, the first 3 octets should match, and of course the last one should be different, if it isn't the same in the first 3, there is a high probability that what actually broke everything was the fact your IT replaced or reset the Router, which changed the LAN settings, and those need to be accounted for on the printer.
My PC works fine. It just seems odd that after the network clean that all these issues have started. Again I cannot even download the current software updated from the front panel. Everytime I try the error Cannot Connect, Try Again Later comes on the screen.
The c405 is fine and your PC doesn't work?
This issue began after our email system went down. An IT expert ran a C Cleaner across our network and PC's and since then I cannot download any apps or the software updates. I get an error " Cannot connect Try again later.
Also, I can't even use the WSD scan driver as the machine doesn't see this. We also have a B405 and compared all the network settings and everything is the same and I can download to B405 without any issues.