1. Will I be able to re-use my old hard drive as an extra for my new system?
2. Will the Win7 professional 32bit hard drive work within my new Win7 home premium 64bit system?
3. Will I be able to run Microsoft Office off of my old hard drive (or do I need to purchase a new one?)
4. Will my old Norton Antivirus interfere with my new system's antivirus (if I have to get a new one)?
Thank you very much for any advice you can give me.
You can use the old drive for your new system for additional storage but you will need to reinstall the programs so will need to purchase new copies if you no longer have the install disks or no longer qualify for their use.
The best thing to do is to take all the data off the old drive and reformat it. When you build your new system install Windows with only the SSD attached so the SRP ends up on the SSD.