Thanks seavixen32 and arc exactly what i wanted to know!
Yes I will be using my usb dvd drive to install windows 7 and will follow the clean install procedure per the link provided. Will delete all 4 partitions during installation so I have my whole drive as one partition.
When using my usb dvd drive should I also change the boot order in the bios to reflect the dvd drive as primary or does it matter? When I reformatted my desktop I never changed boot priority just clicked boot from cdrom when turning it on.
Thanks again I have lots of reading to do...... great forum btw!!