Hi Ramon, I understand you lost your contacts. Were your contacts saved to your Microsoft account or only on your computer?
If your Outlook is linked to a Microsoft account, sign in at outlook.com and open People to see if your contacts are there. If they are, they will sync back once the account is added in Outlook. If you deleted them recently, check Deleted Items in Outlook on the web to restore them. If your contacts were stored locally, open Outlook, go to File > Open & Export > Import/Export, and import your backup PST file.
Best regards, Arlene D.