Invalid System Disk after downloading...?

Q: I downloaded Photoshop CS3 from MP3 Rocket and when I opened the files, my computer froze. So I shut off the power, then turned it back on. Then a message immediately showed up saying, "Invalid System Disk". What can I do? I'm done downloading stuff. I know I shouldn't, I just wanted to try the programs out to see if Iiked them. How do I format and reprogram? thanks

A: format and reprogram

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