Corrupt operating system most likely is what he probably meant.
How do you mean it doesn’t boot? Does it not turn on? Does it try to boot into windows? What happens?
If you can get into safe mode by pressing f8 during boot up you could try a system restore.
When buying new laptops with operating system already on it, it is recommended to create a restore cd to boot up and restore with. Most likely the laptop didn’t come with a windows cd and the installation files are on the hdd itself on a separate partition.