How to install Windows 7 on 2011 Macbook Air?

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Sorry in advance for the simpleton questions. Completely unfamiliar with the language and context so apologies ahead of time. I have a mid-2011 MBA 13" 256Gig 4megs. I want to install Bootcamp and Windows 7 in order to use one particular application that does not have a Mac native version and apparently, never will. I won't be working in Windows much at all other than with this application. I have a few questions:

1) And probably the most simplistic. When everyone is talking about an ISO image of Windows 7, where do you get that?

2) I see that you can download Windows 7 directly from MS. Is it possible to do the Windows install from a downloaded file or do I need to "borrow" an optical drive from another computer? Can Boot Camp pull from a file downloaded onto the "Mac Side" of the computer?

3) What is the recommended partition for a Windows 7 install?

4) I have read about 32 bit and 64 bit versions of Windows? Which is preferable for my circumstances?

5) Does the USB flash stick need to be blank? If not, what is the preferable free space?

6) Is the Home version or Home Premium version of Windows 7 ok or is the Professional version necessary?

Again thanks. I can hear the groans already.

1. Rather than an ISO file, I used a disk (burnt in diskutil) with the iso downloaded from technet. (I have a yearly subscription since I work in I.T.)

2. I bought the USB superdrive, (its now connected to a mac mini server). Had I reviewed the install options before hand I would have probably copied the iso file to a USB harddisk instead.

3. My macbook air has 107gb for windows and 125 for OSX. Its really up to you as to how much stuff your going to install into each operating system.

4. 64 bit to use all of the 4gb ram. I believe in 32 bit you lose access to a small percentage of the memory.

5. check http://support.apple.com/kb/HT4818 and http://support.apple.com/kb/HT4840 I dont think it will get formatted, but it does need to be a FAT format.

6. Any version will work I think, I'm using 7 home premium since I had run out of licences of ultimate.

No groans! Any genuine questions are good questions!

 

[LIIIIING]

I try to install windows7 on macbook air for 2 days; but it doesn't work. TT
can you show me how to install it by attach some picture because I'm too
stupid to use computer.
Help me please.
thank you and sorry for my poor english.