if the hard drive containing the data was formatted with a quick format, the data for all practical purposes is erased...
its 'practically', because you might still be able to retrieve fragments of your data from the drive (the data is basically hidden from being able to be seen, the binary 1's and 0's of the drive are rewritten over as just 0's, i believe)... ...if you put that same drive into a seperate computer that already has windows installed... and use a data recovery program, such as 'PC Inspector File Recovery'... you may just be able to recover some of the data, but theres no guarantee at all
a much more expensive option, is to take your drive to a professional data recovery service, but they can charge thousands of dollars to have it done...
edit: you wont need to put the drive in a seperate computer if that drive already has windows installed on it... you can just run the data recovery program from there