This How-To-Guide is intended for users who no longer require a VHD in Windows 7.
Navigate to Start, type diskmgmt.msc in the search bar and press enter. The Disk Management application opens.
Right click on the VHD you want to erase and select Delete Volume… from the drop down list.
A warning message pops up stating that all data will be erased from the drive if you continue. Click Yes.
The VHD has now been removed from your computer.