Sam File deleted by mistake

All these people on the Internet are mistaken. I forgot the password of the XP system and deleted the Sam file. Then the system won't be able to access the bad things, password is required on the Recovery Console (I don't Know). There is no Sam file under the repair file (I don't know why). Why? How can we make the system better?
Can I copy a SAM file from another machine (two machines have different users )?

The Sam file of WINXP is located in C:/Windows/system32/config/. If the Sam file is damaged or lost, all accounts in WINXP will be lost and cannot be logged on through WINXP. To restore the Sam file, copy the Sam file (H:/Windows/repair/SAM) on the Windows XP installation disc to C:/Windows/system32/config. In command line mode, input copy H:/Windows/repair/sam c:/Windows/system32/config/SAM and press Enter.

If you create other users and user groups after installing XP, the accounts will be lost after performing the above operations, because the current Sam file, it only contains the account number generated when WINXP is installed. Therefore, you can log on to WINXP and click Start "/Program/Attachments/system tools/System Restoration, restore the system to the latest restore point, so restore these user settings