Dead Mac. Can I update iPhone to IOS5 on another machine?

I've got a dead Mac that held my iTunes account. All content is safe in external drives. I am overseas and not getting a new Mac for a couple of months, but would like to upgrade my iPhone and iPad to IOS5. I've got another computer (Win7) that I could use to accomplish this, but do not want to wipe these phones in the process. What are my options at this point?

Actually, you can burn a DVD or USB (8GB) thumb drive and let him boot and install from it. Or, you can actually run the InstallESD.dmg file from his machine. I've done both and Lion installs.
Personally, I would burn a DVD or thumb drive so you always have it.
Burn the InstallESD.dmg to a bootable DVD.
Launch Disk Utility and click the Burn button
Select the InstallESD.dmg file from your desktop as the image to burn. Insert a blank DVD and wait for the the image to be burned.
Burn the InstallESD.dmg to a bootable USB thumb drive.
Open Disk Utility and drag the InstallESD.dmg file to the left side pane. Go to the Partition tab ad select 1 Partition from the drop down menu. Choose Mac OS Extended (Journaled) on the left. Click the Options button under the partition table and choose GUID Partition Table. You will need this to make the drive bootable on a Mac. Hit the Apply button when ready to format the drive (it will erase everything on the drive).
Click on the Restore tab and drag the InstallESD.dmg file to the Source. Drag the USB partition to the Destination. Hit the Restore button and it will create the bootable USB drive with the OS X Lion installer

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