|Windows always calls the drive it is installed on C drive. Windows will not let you delete itself so you cannot do this from within Windows for your protection. You can use Disk Manager to delete any or all other partitions and as long as there is not a partition between the C drive and the new unallocated space, it will let you Expand the C drive to fill all of the remaining space. Just righ click on the drive and choose it from the menu.|
Why would you partition a drive as small as 40GB into multiple partitions in the first place? Why would you install Windows 7 on a drive that small to begin with since it will take nearly all of it (possibly more) just to install Windows 7 itself? A 40GB drive is probably a very old hard drive, older than my 11 year old 80GB drive. The odds are that that drive will not continue working that much longer so for that reason I would not recommend using it for anything that is important.
You have to be a little bit crazy to keep you from going insane.