Quote of user: oO_JaVeD_Oo
Hellow frnzz Just use
'FastStone Image Viewer' to Get the Screenshots in the required format and required size !

(Try to search it in 'Google' Frnzz !

)
I use this program because it's so simple than any other programs like Acdsee or Photoshop or watever !
As usual said by Tincho_DJ Bro

Just Keep Ur theme Creator Preview window At the center and see whether it's not covered by your cursor !

Press<
Print Screen> in ur Keyboard and open
Paint application(If OS is Windows x) and paste it there and save the pic with *.jpg as Extension

Now open 'FastStone Image Viewer' and open the image u just saved And first Crop the required screenshot to the required size By using Crop option in the program(save it iwith *.jpeg extension)

And same to do with Menu Screenshot Also

Final thing ,u have to do this process two times as one for Desktop Screenshot and other for Menu Screen shot !
Thats all !
Ur screenshots are Ready to post Frnzz
I hope this helps !
Thanks !
if we already created theme from theme creator ... and save it to the computer, we can't upload it anymore, right .. ! so it's that mean we should create the theme .. once more ... ???