Change System Information In Vista
Here are simple steps to customize system information in vista.

Customize Logo, Manufacturer, SupportHours, SupportPhone, SupportURL.
1. Create a logo of size 120×120 pixels in .BMP format and save as logo.bmp (you can use any image editor for this or open your favourite logo in paint, resize it and save as logo.bmp).
Save the logo.bmp in C:WindowsSystem32 folder.
2. Copy the below code and save as change.reg
|
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionOEMInformation |
Customize “Crazytech”, “24×7″, “000-123-1234″, “http://www.crazytech.net” with your information.
3. Double click on change.reg and click on yes when prompted. Now find the changes by right clicking Computer > Properties.

Change your Windows Experience Index.
(To do this you have to disable UAC first)
1. Go to C:WindowsPerformanceWinSATDataStore open the latest ‘2008-11-02 19.55.37.718 Assessment (Formal).WinSAT.xml’ in a WordPad. (Date and time differs in the format YYYY-MM-DD HH.MM.SS.XXX Assessment.WinSAT.xml select the latest file)

Change the highlighted fields (not more than 9.9).

This tweak is to change your display information only, don’t expect it to increase your system speed !

