How install Windows application using Parallels?

Okay this is confusing. I have a Macbook bought windows vista, installed it. Then installed software on Windows side (its only Windows compatible), works fine. NOW, i got parallels, installed it. I open Windows on the Mac side and I dont see my software I orginally installed (on Windows side). Do I need to reinstall? I rather not, is there a way to access my Windows -side files to use this program? How do I fix this?? This is very frustating.

Installing Windows via Bootcamp will be a -completely- seperate installation from anything from Parallels. Parallels will install windows in a large file on your hard disk. Bootcamp uses a seperate partition.

If you want to use your application, you have to install it again in Parallels to see it.