This problem is caused by a small file called "autorun.inf" just delete this file will do all the work for you.
But this file has system and hidden attibutes, therefore to delete this file follow the instructions :-
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.