the main reason i don't use 64bit windows is because of extra 15-20gb space it requires.
A fresh install of Win 7 64 bit (or server 2008 R2 as I have installed) takes less than 10 GB. So what exactly you meant by "extra 15-20 gb"? lol
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Also, someone who has to open more than 50 tabs at once has some serious work management issues.