Recognized my 4gb transcend pendrive

Try windows repair, it should fix the problem.Else connect the pendrive and check the port settings.You can check for the port settings by
right click on "my computer"-->properties-->hardware-->device manager
A new window opens and at the bottom probably you'll find "Universal Serial Bus controller". Expand that option and check whether all the ports are enabled.If the pendrive is still not detected, then the problem is with the port.Check the same with the other available ports.Any further doubts add comments.Would be glad to answer.Good luck.

Throw your usb and buy a new one