The capacity of my hard drive 500GB and I have 1GB of RAM . Can I install Ubuntu 12.04 and Windows 7 on my system as dual Boot?
closed as too localized by con-f-use, Jjed, John S Gruber, Mitch♦, Stephen Myall Aug 25 '12 at 12:50
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You should understand that there's no difference if you're dual-booting with Windows 7 or not (well, maybe only in terms of disk space available) - the performance of the system will be the same as if Windows or Ubuntu were the only OS on the machine.
If you're happy with how Windows runs on the machine now, then it'll be no different after you install Ubuntu.
1 Gb of RAM is not a lot by modern standards, but it's more than Ubuntu's minimal requirements, so Ubuntu will run OK too.