Unable to open drives by double clicking.

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This is caused by a virus or malware mostly. This type of viruses and malwares spreading through a flash drive which you are taking everywhere. The problem is when you have removed the virus or malware using a virus remover or malware remover still you can't open drives by double clicking on them. This happens because the changes that happen to registry values not been set to normal by the virus or malware removing software. So we need to manually re correct them.