V-Vocal is greyed out ? how to solve it !
http://imageshack.us/photo/my-images/138/d97s.png/

Have you used Audio Snap on it?
 
Try bouncing it to clips and then try VVocal again.

FYI, I don't think VVocal works on groove clips either.  I can see this clip isn't a groove clip, but just thought I'd pass it on.
 
It's also worth splitting clips into shorter ones when using VVocal.  It's worth looking at Bitflipper's tips on VVocal, as well:
 
http://forum.cakewalk.com/tm.aspx?high=&m=2276613&mpage=1#2276613

No audiosnap used or activated.

This is a plain recording and it is bounce'd down, it has straight corners !
so i cant figure out what the problem is..

I can see it has straight corners, that's how I knew it wasn't a groove clip.  Just try selecting the clip and choosing bounce to clips and see if it works..

i right click the clip, and selcted, bounche to clip(s) " , still the same problem no V-Vocal, showing up !
Also removed any FX from the FX bin...

V-Vocal has not changed since the last time you reported this issue.
http://forum.cakewalk.com/FindPost/2677285

Copy the clip into a blank project - see if VV works there. (make sure you have identical tempo maps, if you have any tempo  changes)

Gahh this is annoying... ,anyways thank's for trying any solution.

Ok will try the tip you gave .

Made a new project and put the tempo to the same and copied the audio only into it
same problem ,no V-Vocal ;-/
http://img818.imageshack.us/img818/6830/w97g.png

Need to get outside before my head explodes 
Guess i need to do a complete re install of my computer once again, thanks anyway..

I think V-Vocal is 32-bit....looks like you have a 64-bit machine.  I've gotten it to work on my 64-bit machine by doing the 32-bit installation.