AquariZ

okay here is my ongoing problem. i just bought a new Windows Compaq Vista computer. and i also bought magix music studio deluxe 12 program. now ive used Magix audio studio 2005 deluxe program for year to do all my recording/music. but i had a problem with my old computer so i needed to start all over, and my old magix program isnt compatible with Vista. anyways, everytime i attempt to record, and play back just Vocals, all you can hear is my voice and a HUGE LOUD whistling sound thru the entire recording. and i cant seem to make it stop/fix it. i know it is not my mic because ive check it on other computers, im thinking the problem is with the Magix program (maybe settings are off?), i think that, because when i just turn on the microphone, with my headphones on and just talk into the mic its crystal clear...
i have a sample of what the recording sounds like if you can help id love to send it, either tell me your email thru here, or you can email me at aquarizmusic@gmail.com

somebody please help, because if its the computer itself i need to know asap i have 1 week left to return it.
thank you so much if you can help!