Hide ur drives and Lock ur drives

Open Registry (go to run command, type "regedit" and press enter)
then go to this key
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer
now right click in right side pane and create DWORD Value (blue color)
Rename it as "NoViewOnDrive" (for locking drive)
or
Rename it as "NoDrives" (for Hiding drive)

double click on it and put some numbers to lock ur desired Drive and click OK.
DRIVE NOS.
FOR A : 1
FOR C : 4
FOR D : 8
FOR E : 16
FOR F : 32
FOR G : 64
FOR H : 128
finally restart or log-off the computer to take effect.
Keep in mind that "0" is Default Value to Disable or remove this setting..

After locking the drive when u try to open it, u will see a msgbox like this"This operation has been cancelled due to restrictions in effect on this computer.
Please contact your system administrator"

Put an image/photo as folder background

You have to have a photo in ur folder for example:
sample.jpg. After that, just open notepad and

write: [{BE098140-A513-11D0-A3A4-00C04FD706EC}]
ICONAREA_IMAGE=sample.jpgICONAREA_TEXT=255

Save it as desktop.ini and press F5.

Download YouTube videos in different formats.

There are much easier ways to download videos from YouTube, but the downloaded videos are in Flash video (FLV) format which can only be played by few media players,
notably VLC player.More often than not, you'll want to convert those videos into a different format. So this would mean using more software on your machine.

Enter Vixy.net! What does it do?First of all, it can be used to download YouTube videos. The second and the important thing is, Vixy.net is a free online Flash video converter. It can convert a Flash Video(FLV) file to MPEG4 (AVI/MOV/MP4/MP3/3GP) file online.You can then download the converted file.How to convert a video?A no-brainer! Just provide the YouTube video url, select a format that you want to convert to, and click Start.Vixy.net will convert the video and provide you a download link.