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#11
It depends, If you noticed the "media refreshed" .iso's they are continually updated with the most recent operating system updates.
If you went out to buy one you would have to check and make sure it at least included ServicePack1.
You could install over top, but see my first answer.
Driver backups for specific situations would be handy, but 7 already has enough drivers included that it should get you up and running.
Yes, a clean install would format the drive. Unless by "over top" you mean to do a Repair Install.
If it is that valuable, and it was me, I would have at least 3 copies of it before I did anything to my machine.
Your system specs are incomplete, you're only showing Windows 7 home premium. Do you have a 32bit or 64bit system ???
From the limited amount of information you offer, I can only assume you will need this:
English version, Windows 7 Home Premium x86 SP1 U (media refresh) X17-58996.iso
If you insist on using a 64bit version you will have to run the unlocker mentioned in Step1 of the Clean Install Tutorial, but why waste a 64bit OS if your machine wasn't built with 64bit capabilities? It may run, but it will not run as well.