What is this meanning

from last 1 or two days, a msg appear on my screen what is it mean? plz help i dont know wat to do with this after closing it appears again. this mostly appear when i connect to net. actually i reinsatall my wind 7 a week agoCapture.PNG

You may be having a drive like a floppy drive or SD card, flash drive,etc. that is logically present in the PCs OS but not physically connected or detected.
To resolve the issue, use one of the following methods:
Insert a removable disk in the removable drive before you start the computer.
Change the drive letter assignment for the removable drive to a letter other than C.

To change the drive letter assignments in Windows 7, follow these steps:
1.Log on to the computer as Administrator.
2.Insert a disk in the removable drive.
3.Click Start, right-click My Computer, and then click Manage.
4.Click Disk Management.
5.Right-click the partition, logical drive, or volume that you want to change, and then click Change Drive Letter and Paths.
Click the removable drive, click it, click Change, click the drive letter that you want to use, and then click OK.

Alternatively for a non-existent drive showing up, you may simply remove it.
N.B. : Please exercise caution while doing it .

@RAMITZAR thanks for reply i will try it and post if not solved.

Well, you can check the hardware wires and than uninstall all the virtual drives from the computer. After that you can restore your computer if its possible or if not than you can start your computer in Safe Mode. After restarting your computer in Safe Mode ,you can manage the drive from drive management just right click on the computer and manage the drive, you can change the letter from e to g or anything else as per your requirement. It happens sometimes before doing anything make sure you have saved the back up of your computer or try to restore first.