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Following are one of the best shortcuts of MS Excel :

1. Outline border to the selected cells - Ctrl Shift &
2. Change Date format with day, month, and year - Ctrl Shift #
3. Change Time format with hour and minute, AM or PM - Ctrl Shift @
4. For the current time - Ctrl Shift :
5. For current date - Ctrl ;
6. Hide selected rows - Ctrl 9
7. Hide selected columns-  Ctrl 0
8. Display Farmulas / Alternate in the worksheet - Ctrl `
9. Display the Find / Replace dialog box - Ctrl H
10.To insert Hyperlink - Ctrl K

Along with the core operating system and programs that Windows XP runs when it
starts, there is also a host of services involved. Many of these services are necessary
for Windows XP to operate correctly. However, many of them are for features in
Windows XP that you may not use at all. You can peruse the services and disable any
service that you do not want to run. The fewer services that run, the more quickly
Windows XP will boot.
To reduce the number of services that start on bootup, you can access two different
areas of Windows XP.
o The first is the System Configuration Utility. You can do that by entering the
command “msconfign the run menu.
Start Run “msconfigwithout quotes) || Hit Enter
The Services tab shows you the services that start when the computer
boots. You can stop a service from starting by simply clearing the check box
next to the service and clicking OK.
o However, before you do so, there is another way to disable services that you
may prefer because the interface gives you more information about the service
in question.
Open Control Panel Administrative Tools Services or

I have just accidentally found out another way to give you an extra boost in
windowsXP’s boot performance. This is done by disabling your unused devices in
Device Manager. for example, if you don’t have input devices that are connected to
one of your USBs or COM ports, disabling them will give you an extra perfromance
boost in booting.
Go to Control Panel System Hardware tab Device manager
Disable devices that you don’t use for your PC and then restart. See the difference for
yourself.
Bonus Tip: Perform a Boot Defragment
There’s a simple way to speed up XP startup: make your system do a boot defragment,
which will put all the boot files next to one another on your hard disk. When boot files
are in close proximity to one another, your system will start faster.
On most systems, boot defragment should be enabled by default, but it might not be
on yours, or it might have been changed inadvertently. To make sure that boot
defragment is enabled on your system, run the Registry Editor and go to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
Edit the Enable string value to Y if it is not already set to Y. Exit the…

After installation of new software, in start menu you will get a small pop up which will highlight  that new software is installed.

We can disable / enable this option using the following way :

Right Click on Taskbar and select properties

Goto Startmenu Tab and click Customise

And in Advance Tab, Clear Highlight Newly installed programs  check box and press OK