I upgraded to Windows 10 last week and all went well until I tried to add a new printer. I have a wireless network, with 2 printers. The HP printer/scanner is recognised, but the Brother printer used for bulk printing isn't found automatically, and when I use the "Add a printer" option, the system crashes and Windows closes down with a "system thread exception not handled" error message. The only way I've found to recover is by reinstalling Windows 10, which isn't ideal. This has happened twice, at exactly the same point in the "Add a printer" process.