hi there its me again

ok i got my copy of windows 7 i download from msdn academic alliance..
-it is in iso format
-so i need it to burn it into a dvd using active iso burn
-so after burning can i use this dvd to install the os right

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another is
i have this desktop which has 1gb ram, intel core 2 duo, and 140 total GB memory, (this pass the system req.?)
-the current os is xp
-has 2 partitions which is drive C: D:
-so windows is in drive C:
i need to clean install the windows 7 but still i need to have the 2 partitions C: D:
questions.
-how to clean install windows 7 having 2 partitions (50gb for C: and the rest for D:)?
-does windows automatically format my hardisk?
-after the os is successfully installed.. can i access the internet just like the previous os (xp)?
-does windows automatically updates the drivers of the devices?
sorry about this.. i been surfing the net but (for me) i didnt find the answer
thnks in advnce for the help
