I tricky one - I donwloaded SF when it was new using the EA downloader - thats now changed and become EA Link (or something) so am not sure how it works.
I do know that if you purchased a copy you will be able to download it again without paying, however it could be tricky if you haven't used the EA link thing before (e.g. you may have to get tech support to adjust your account)
When its downloaded it used to land in a cache folder (whose contents you could burn to DVD, so if you had to format all would be good)
I think SF is about 1.3gb so I can't stick it on a webhost (they get pissed off enough about the 10gb of battlerecorder files in/out of the website each month

)
I could however stick it on a DVD if you want. (PM me details) - you can retrieve your SF key from within your EA account thing on EA.com)
cheers,
MonkeyFiend