You have an Acer Aspire 5741Z-5433 that you let someone who said they were a computer programmer work on and now it says that Windows 7 installed is not genuine. When you try to restore to factory settings, you cannot find an Acer Erecovery program on that computer. Also, you cannot find an Acer Erecovery management site.
Do you have any important data on that laptop that you want to keep? Click on your "Start" menu and click "All Programs". In a program list click an "Acer" folder, then click an "Acer eRecovery Management" icon.
Windows User Account Control may ask for your permission to run this program, click "Yes". From an "Acer eRecovery Management" window on left click "Restore", then click "Completely Restore System to Factory Defaults". On a "Confirmation" screen, select "Yes" and click "Start".
Finally click "OK" to confirm restoration and then your computer will restart. After that computer restarts click "Next" if you agree to a notice on your screen. That notice is informing you that all your data will be erased.
If you have not backed up your data click "Cancel" now. Next you get a final confimation screen. Click "Next", then click "OK" to start that recovery process.
That recovery may take a while to finish. You will get a confirmation screen when it is finished. Click "OK" to restart your computer.
If you cannot find an Acer eRecovery program folder on your computer then restart that computer. When an Acer logo appears on that screen, press Alt and F10 keys repeatedly. If you are prompted with a Microsoft Windows boot screen, press an Enter key.
After that system recovery application has loaded, follow some prompts to reinstall an operating system.