my laptop had windows 7 home premium,at work they up grade it to professional
my laptop satellite toshiba had windows 7 home premium os,at work they up grade it to professional since i work in educational institution they have agreement with microsoft ,since am away from job for 6 months i started getting a message saying my copy is not genuine.how can i go back to my original os?.thanks
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You can't, you should have them enter their product key. They wasted your home premium license.
Though I think they upgraded it to Pro since it has the business functions.
run the system recovery. You MIGHT be able to just do a "change key" but I doubt it.