Problem with hard drive

i put together my first computer the other day, and now im having problems with im assuming the hard drive, every time i turn on the comp the hard drive clicks and it takes a couple of times to get to windows, now i cant get to windows and the hard drive clicks like the directional in your car, ive tried unplugging the hard drive and plugging back in the hhd still same problem. my system is-- gigabyte ep45-ud3p mobo,,vista premium 64bit,,q9550 cpu,,SEAGATe 1TB HHD,,8 gigs mushkin ddr800,, is my hdd gone??? if it is can i reinstall vista on a new hdd or do i have to purchase a new vista disk, please help, any suggestions greatly apprecieated!!

thanks joelg88 thats what i figured, also is it normal for a 1tb hhd to have 931 gb of space brand new?? and can i reinstall vista or do i have to get new os disk??

thank you Zorg