Disable Passport Pop-Up

Normally, WindowsXP will prompt you 10 times that You Need a Passport to use WindowsXP Internet communication features...
To disable this

1. Start Regedit
2. Go to HKEY_CURRENT_USER \ Software \ Microsoft \ MessengerService
3. Edit the binary key PassportBalloon
4. Give it a value of 0A (0A 00 00 00)

Show Hidden Devices

You can show hidden devices in the Device Manager. One way is by making a simple registry change. The other is through a batch file.
Registry Change:

1. Go to HKEY_LOCAL_MACHINE \ SYSTEM \ ControlSet001 \ Control \ Session Manager \ Environment
2. Create a string DEVMGR_SHOW_NONPRESENT_DEVICES
3. Give it a value of 1

Download reg file

Batch File
@Echo Off
Prompt $p$g
set DEVMGR_SHOW_NONPRESENT_DEVICES=1
start devmgmt.msc
exit