Since the beginning of August I run Windows 7 Ultima and it is very fast. I run the 32-bit version which means that more than 3GB on RAM is not addressed so useless, but startup of the PC in approx. 30 sec. Better multitsaking with multimedia applications. But let's be honest I had two blue screens during heavy PC usage (Video editing while music listening or such. And it can also be my PC that is more than three years old.
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