Windows 7 - Installing Windows 7 with a virtual DVD ROM?

Ok, newbie question time ..... (Don't you just hate 'em?)
I have spent 2 hours looking through numerous indexes and still no go!
Looking for info on installing Windows 7 with a virtual DVD ROM.
Even with detailed search, lots of irrelevant stuff comes up.
Any Ideas? Is there an easy way to find stuff?

You can start the installation process from within another version of Windows. You'd have to mount the ISO with a program like MagicISO or Daemon Tools.

Alternatively, you could install it from a USB drive, following these instructions: How do you make a USB drive bootable so I can load W7 on a netbook?

Thanks, I have Novicorps Win2flash (and have used it - it's great) but that's not what I'm interested in at the present time.
Mounting? That sounds rude! Maybe it isn't ....... Is that the same as using Virtual CD/DVD software?
Anyway, I'm a newbie - please be patient!
btw - I had to dump DT cos ImageBurn says it was not compatible - then spent hours trying to remove SPTD. Of course now I know how to remove it, it was simple!

Download PowerISO trial version, right click on Windows 7 ISO, mount to virtual drive, run setup to install.

Basically same as running Setup from the previous OS desktop.

Better to boot from an actual installer so you can get the cleanest install possible, formatting the HD first.