It takes quite a  little bit longer in windows 7  in  to restart and shutting down when you have a lot  of application installed in your computer even if you already obtained a 2 gigabytes memory installed in your motherboard,  I have my experience when it comes to this situation, my computer entails with 2 processor, 2 gigabytes ram  and i gigabytes video graphics. but because  of so many heavy application like 3d max, adobe photoshop,  corel draw and dreamweaver  plus the antivirus.. my computer gets slower so what  I did.. I do the step below to improve the shutting down of my computer.
changes for speeding up your shutdown time is as follows:-
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro  l
Tutorials on How to speed up shutdown time in windows 7
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windows 7