Search what you have backed up for *.mny files and *.mbf files. I hope you have more than one. Check the dates on the files that pre-dates your new Windows 7 install to see which is newest, and should therefore have your newest
transactions.
If you only saved the one Money file, then I would think whether you might have backed up to a USB flash drive more recently than June 2009.
You did not say what version of Money you were using, but starting with Money 2006, by default, Money would keep 4 time-stamped *.mbf backup files upon exit.