NTW won't load

I've recently upgraded from Vista to Windows 7, NTW worked well in Vista but now I've just re-downloaded it from Steam (i lost all my c:\ files) and when i click 'play' and it says' preparing to launch Napoleon total war' and then...............nothing. it doesn't open it's not running in the background or anything

I have Windows 7 32 bit
Napoleon Total War Imperial edition
No Mods
legit version of NTW

I've searched for this in other threads and not found it, i think it's quite an ambiguous topic so i'm sorry if this is solved somewhere else

Ta, Grim

Since I don't have the the rest of your specs, either http://www.twcenter.net/forums/showthread.php?t=238484 or install the 64bit disc.