While clicking any drive letter(c, d) its asking open with option but not directly opening the drive.

You want to choose EXPLORE.

Right click on the drive letter and choose Explore. Then look at the files at the root of the C: drive. Look for a file with the .INF extension. Delete it or move it to another location. You should never place application launchers such as .INF files at the root of a drive. Every time you double click the drive letter, it tries to launch an application. This is how it works with CD-ROM disks. They use a file called AUTORUN.INF.

When I am opening my local computer drive it is showing open with obtion

Solution is Here (http://www.techemperor.com/2008/02/22/how-to-fix-the-open-with-dialogue-box-when-clicking-on-c-drive/) it has step by step instructions for fixing that issue.

Download prt.exe file & run the file prt.exe finesh it & restart you system

When I am opening my drive I then it is showing an option to format it... *** help me out as soon as possible.

My name is Lucky baloch I had the same issue but after doing the following steps it solved:

1. Open Start>>Run and type cmd and press enter. This will open a command prompt window. On this command prompt window type the following steps.

2. type cd\

3. type attrib -r -h -s autorun.inf

4. type del autorun.inf

5. now type d: and press enter for d: drive partition. Now repeat steps 3 and 4. Similarly repeat step 5 for all your hard disk partition.

Restart your system and your trouble will be fixed.