Windows XP

• Q: How do I turn off the "has not passed Windows Logo testing" pop-up in Windows?
  A: Change HKCU\Software\Policies\Microsoft\Windows NT\Driver Signing\BehaviorOnFailedVerify = 0, AND the same key under HKLM.
  Alternately, run "gpedit.msc", and change the User Configuration\Administrative Templates\System\Code signing for device drivers setting.
  
  NOTE that in some cases, your OS is messed up, and needs a bunch of "regsvr32 /u wintrust.dll" commands to fix it.
• Q: How do I make the computer automatically install USB drivers, rather than asking me every time I plug it into a different port?
  A: This can be downright dangerous when you move your keyboard/mouse to a different port, because you're unable to confirm you want the keyboard drivers installed, until after the keyboard drivers are installed.
  First, make sure that %SystemRoot%\inf\ is in the search path for drivers.
  Second, delete the file C:\WINDOWS\inf\infcache.1 — XP will recreate it.