Extending a Windows 2008 R2 Disk

Good Morning,

I'm running a Windows 2008 Standard Virtual machine which has SQL 2005 installed, on VMWare ESX 4.0 (Update 2)

I need to extend one of the SQL drives as it's starting to run low on available disk space.

Therefore, I edited the size of the disk through VI client, and then logged onto the virtual machine, done a rescan of the disk.  The new 40GB of disk space that I allocated was showing and I was able to extend my current disk into the new space.

The strange thing is that through computer management, it's showing the new disk size but hasn't updated the free space.  Also from the 'My computer' view it shows the original size?

Has anyone seen this before?

Thanks