Automatically close the non-responding Program

With a small registry tweak, Windows XP can be set to automatically close any program that 'stops responding' (crashes), eliminating the need for you to use the task manager to close down the offending software manually.

Steps:
Open REGEDIT and navigate to HKEY_CURRENT_USER\Control Panel\ Desktop
Modify the REG_SZ entry AutoEndTasks with a value of 1

Note:
Without having much knowledge in Registry Editor Dont try. Before editing registry take a back up.
Back Up Registry:
Start --> Run
Regedit
File --> Export
And export the registry to the safe place.

View Contents of Rar before Download

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Most of the files we download from the Internet are in Zip or Rar format. We wouldn’t like if we download an archive to find that the file we are looking for is not there. And it is also such a waste of Bandwidth and time to download a whole archive just for a single file. Archview is a Firefox addon that lets you preview the contents of an Archive before downloading. And using it you can even download a single file from the archive.
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Currently it supports only RAR, ZIP and ISO format but that should be enough as they are the 2 most popular and common formats being used today. Archview adds itself to the stats bar and becomes active when the user clicks on a zip or rar link. It displays the contents almost instantly and presents the files of the archive in an XML or HTML interface. And what’s more, it even lets you download individual files for an archive, now no need to download a 10 MB archive for a file of 100 Kb that is inside.
The future version will also add support for the 7z format. It supports Firefox 2 and Firefox 3. It is definitely a great add on that can save you a lot of bandwidth.
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Link:
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https://addons.mozilla.org/en-US/firefox/addon/5028
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Screen Shot:
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https://addons.mozilla.org/en-US/firefox/images/p/14140/1180087129

Shortcut by mouse wheel

1. History in a tab : Keep [Shift] key pressed and roll your mouse wheel you can go back pages or go forward pages.

2. Zoom in/out : Keep [Ctrl] key pressed roll the wheel to zoom in or zoom out

3. Press [space] key to move down page. Keep pressing that key you can't page up by rolling mouse wheel.

How Do U See Hidden Files, Using DOS

at command prompt just type
dir /ah
if the list is too long u can use
dir /ah/p/w