On double clicking on a partition in "MY COMPUTER" the SEARCH window is starting instead of showing the contents of that partition. In order to see the contents of a partition I have to right click on the same and select "OPEN" from the options. I am not able to change that default search option.

Please provide me the solution.

Welcome to BC aparichit

Run CHKDSK on that drive and try Doug Knox's folder_open.vbs if you continue to have problems.
Save the file to your desktop and double-click on it to run the script. If you have a script blocking program you may receive an alert and have to give permission to allow it to continue. A confirmation dialog will appear when finished.

If the above does not resolve the issue then your symptoms could be related to a flash drive infection. In that case download Flash_Disinfector.exe by sUBs and save it to your desktop.

• Double-click Flash_Disinfector.exe to run it and follow any prompts that may appear.
• The utility may ask you to insert your flash drive and/or other removable drives. Please do so and allow the utility to clean up those drives as well.
• Wait until it has finished scanning and then exit the program.
• Reboot your computer when done.

Note: Flash_Disinfector will create a hidden folder named autorun.inf in each partition and every USB drive plugged in when you ran it. Don't delete this folder...it will help protect your drives from future infection.