- Can I delete windows 7 on the hard drive and keep the rest of my stuff?
Sure you can, of course you can't delete a copy of windows while you are running it but you can certainly delete it after connecting the hard drive as a secondary drive.
After that can I download a fresh copy of windows 7 on to the SSD. Can I still access my old info from my hard drive?
Generally yes. In some cases it may be necessary to fiddle with file permissions to get around access denied errors.
To make sure there is no confusion I recommend disconnecting the hard drive and connecting the new SSD to the first SATA port. Then after doing the new install of windows attatch the hard drive to a higher numbered SATA port.