Sims 3 says it needs an update before i can install the rest of my games but its already udated

Reset your PC simplest way to describe how to fix whats happened, then run Origin as a administrator.Right click Origin shortcut and choose Run as Admin - After this load My Games -  Right click Sims 3 then check for updates again if this does not work, try Right click Sims 3 and select Repair install. Go make urself a cuppa while this does its work.

When i right click it doesnt come up with either of these options

What is your base game version right now ?

Open the launcher and check the number in the lower left corner.

If you're not at 1.67, please update your game.

Manual links can be found here: http://answers.ea.com/t5/The-Sims-3/FAQ-Patch-1-67/td-p/67858/

The patch i need also wont install. it comes up saying 'an error has occured'

sorry, it comes up with "update error: invalid file found " 

this does not work. all this done was make my screen go black and now my laptop is just running slow. i still cant play my addon games

Do you still get the same error message ? Does the launcher not start anymore ?

Could you post your Computer's DxDiag?

To gather a DxDiag on your computer, please follow the steps here: http://answers.ea.com/t5/The-Sims-3/HOW-TO-DxDiag-for-Sims-3-PC-Only/td-p/1049584/