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Ru satisfied with the answers or not? Using all these virtual machines ur system will get slow, unless u have a large RAM for ur system. Better use it as a dual booting system. then it will be ok. otherwise increase ur RAM.
With regards to the RAM situation, normal windows distributions (Win XP, Vista,..) cannot use more than 2.5-3GB worth of RAM. On the other hand any linux distro will correctly handle all of the available system RAM.
As such I would recommend running windows in linux rather than the other way round.