What does System not modified mean on PC

Bought cheap editing software,the movie vegas pro 9, the only thing in box was the disc and small page of what to do. All was going well until it say, error with some numbers on so and so setup. Click ok and then it read, System not modified' try installion at later time. I had my computer clean and supposely upgraded but is going on? What did I do wrong or what do I have to do?
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More about what system modified
  1. Check the system requirements for the software and see if your system meets them.
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