I bought a system with 500 gb hard drive on which i installed windows xp on c drive of 40 gb. D is of 40 and rest is in E.
After that with the help partition manager i extracted 40 gb from e and made a separate drive m on which i installed windows 7 preview.
Now i want to install another operating windows vista ultimate and i want to set accessibility options so that windows vista and 7 should not be able to access any other drives making my system less vulnerable to viruses as windows 7 is beta version.
And also tell me how to uninstall operating system one by one.