janharders - 9:03 pm on Sep 21, 2008 (gmt 0)

you cannot just "convert" from 72dpi to 300dpi because there's information missing unless you only need a smaller version of the logo.
dpi is dots per inch, so 72dpi can't magically turn into 300dpi because the computer couldn't know what to put on the 228 remaining dots per inch - if it doesn't look too crappy when you change the resolution (generally just a resize), it might be fine, otherwise you'll have to redo the logo.