Will Eraser wipe out Windows 7?


New Member
I am wanting to clean up my old laptop that came with Vista installed on it and they sent me Windows 7 to change it out. Having just found this message board I am not seeing this question asked but will eraser wipe out the installed version of Windows 7 when it cleans up my computer? Also I am not seeing where there is a charge for this program. Is there one? If so how much does it cost to use it once? Thanks for your help