@rezviper I am sorry to hear about your computer ☹️
Good news is you can get it all back! Content purchased from the Sims 3 store can be downloaded from your purchase history: http://store.thesims3.com/purchaseHistory.html Make sure to log in with the account you used when you purchased the content.
As for the base game and packs/expansions, you would need to download/install Origin client. Once installed log in to the client using the same account you would use on the Sims 3 site and the base game should show as available for download. Expansions/packs can be downloaded if you right click the base game tile and select 'View Game Details'.
Let us know if you have any questions!
