Recover The Original OS On Laptop After It Crashed?

But my biggest obstacle is that I am just a layperson with very little knowledge of computer lingo. plain non-technical language. LOLMy HP touchsmart tm2 crashed a few weeks ago after I tried making a recovery disk using drive D on the laptop (which wasn't the smartest thing I could've done!). After a 4 hours, I got the error message that I did not have enough space. But when I tried to undo it by doing a restore point prior to the recovery disk making, it did not work and i ended up with zero memory left on my computer which led to the computer crashing. When I tried a factory reset, it did not work and i ended up with a computer that does not boot... some error i could not recall anymore.

Bottomline, I had my computer sent to a "technician" here in my city who said there was no way to boot my computer except to replace the OS.... which he did by putting a Windows 7 Ultimate operating system into my computer. It now works fine... EXCEPT for the fact that this is a pirated software. He warned me not to do updates on it as it will detect the illegal software and freeze my laptop. I cannot live with the fact that I am now using an "illegal" software when by rights, I still should be able to use the original "legal" one which came with my laptop when I purchased it.My other problem is that I did not create a recovery disk way back when i first got this laptop, so I couldn't do it from there. I have the product key to my windows 7 OS but i am not sure which version of windows 7 came with my laptop originally, i only know that my laptop has a windows 7 sticker on it plus the product key sticker in the back.