Changing Bootup Sound in Vista

If you want to change Vista's Bootup Sound you should do only at your own risk (and after creating a system restore point, just in case). You can find the instructions here:

http://vistahelp.blogspot.com/2007/01/how-to-replace-vistas-startup-sound.html

Disable autotuning to improve wireless connectivity

If you're having problems with wireless networking, it may be because the router or WAP is an older one that is not compatible with the tuning feature in Vista. That happens a lot with public hotspots. If you disable the autotuning feature, you may get better connectivity. Luckily, it's an easy fix:

1. Open the command prompt with administrative privileges by right clicking its icon in the Accessories menu and selecting Run As Administrator, or by typing cmd in the Search box and hitting Ctrl+Shift+Enter and responding to the User Account Control dialog box.
2. Type: netsh int tcp set global autotuninglevel=disable
3. Press ENTER

You should get a message saying "OK"
You have to restart Windows to apply the change.

Perform a clean boot procedure to prevent background programs from interfering

Sometimes you just want the computer to start clean. You just want to start the computer and not have a bunch of programs start up automatically. This gives you a lot more system resources to use to play processor intensive games and other applications. Well, here are some great instructions on how to get Windows to come clean
http://support.microsoft.com/kb/331796/en-us