how do I get my space back from a partition?

[AMD6415]

A while back my friend was on a big Linux kick and threw Linux on my netbook even though I didn't really want it. Anyways I went in to the Disk Management and did what I thought was deleting the partition, but I think I did something wrong or Im just not done yet because it didn't add any more space to my main drive. What do I need to do? Thanks for your help

Im not sure but maybe these will help some

 

[KSoD]

You need to format that partition to get the space back. Either use the Disk Management tool or read the sticky thread for Gparted.

 

[AMD6415]

OK of course after I did that I didn't have enough time in between classes to format the partition so now when I turn my netbook on I get this
GRUB loading.
error: unknown filesystem
grub rescue >_
how do I get past this? and what do I need to format that partition to so this won't come back up next time?
thanks for your help

 

[KSoD]

GRUB Loading means you tried to install Linux. You need to use the Vista DVD to repair the BCD.

Repairing the Windows Vista Bootloader - NeoSmart Technologies Wiki