How can i change the start menu margins?
I used the style hacks but i can make the left side bigger ether the right side of the start menu.
I want to make my start menu size like Windows 7 size. 
See this image
How  much pixels is Windows 7 start menu left /right size ? [ as i dont like much the form / sizes of aero microsoft use , i dont know much about it], anyway i made a quiq modification for you, though must changed also othr parameters likw the search of start menu etc
this is just an example that you can do it via hex editing.[so i made this visual style as an example with hex editing , for see how this parameters changed to ista style builder]
On vista style builder go to
 Start > Panels > Basic > Prog list  >  and change the parameter 
DEFAULTPANESIZE : Rect  from  
0, 0, 261, 383  to a value you like .
also change all other elements exist to the Basic section and have on their  DEFAULTPANESIZE : Rect the third value --,--261,--  as 261 , so chane that to all with that you want.
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