Fahd.

Try restarting your phone after taking out the battery first and putting it back in. See if that helps. If it doesn't, there are known problems with win7 64 bit machines. If that applies to you, your best bet is to either use try the workarounds found here: http://wiki.maemo.org/Updating_the_t...nd_Workarounds

Other options: find a 32bit machine, or download (this would be your better choice) a LiveCD of any linux distribution (although Ubuntu is probably the easiest one) and start flashing from there.