Hello ringo14, welcome to Seven Forums!
From the snip you posted, D: is Windows 7 that you want to do away with, is there data you want to keep on E: and F:?
If not you could use Option Two in this tutorial at the link below to get rid of W_7 and reclaim all that space back into Vista at the same time; though if you go that route I'd do a wipe to the W_7 partition before you did the resize. Partition Wizard : Use the Bootable CD
click to enlarge