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#11
Windows 7 is comparable to Windows XP in speed. Vista is light years behind of Windows 7 in terms of speed. That is what I have written many articles about too in some other sites. Windows 7 is one of the first Windows OS that works faster than the previous version (Vista) with same amount of memory. Microsoft seems to have stopped the trend of newer versions of Windows needing more hardware requirements.
In some cases, I would say Windows 7 is faster than even XP especially in startup and shutdown etc. from my personal experience. But go for 32 bit as mentioned earlier.
Also keep the UAC activated and go for MSE as the security suite as that is very light and would perfectly fine for your 2 GB RAM. And its free too. Dont keep too many programs open at the same time and your 2GB RAM would work like a charm in Windows 7.