When i insert the disc (need for speed most wanted (PC)) the launcher pops up, i click "play" and then i get an error message saying "unable to read the disc" i am still able to install and delete the game but i can't play it can you help me find what is wrong and how i can fix it?

SOURCE: game cube not reading disk

I have a game cube that does the same thing. I open it while it's turned off and put my finger on the eye and slide it back and forth a few time. It works after a few tries. I think the gears that move the eye are wore out.

SOURCE: "Unable to read disc" Wii

Your Wii most likely has a problem with the system that reads the disks. If you system is under warranty, you should be able to get it replaced or fixed at no charge, since it is Nintendo's problem. 

SOURCE: GameCube Disc Scratch

There is only one recommendation I can think of but it may damage the disc forever so do it at your own risk. With that said I have done this with about a 50% success rate.

Go to this site and follow the directions: Click Here

SOURCE: Wii "unable to read disc"

If Wii gives Unreadable disc, first step you need to check is to try another disc or clean the exisitng disc. This will confirm that problem is with either Wii or Disc. If the console itself is giving disc read error then it needs to be repaired. You may check out DIY Wii Fix Guide, that will show step by step information to fix the problem yourself. It also gives information on fixing many Wii Related Problems, so its a kind of Wii Problems Reference Fix Guide

SOURCE: unable to read disc message on Wii

Try a cleaning disc. this may fix this issue. if the issue remains, it will confirm a major problem within the optical assembly. you will need to replace the optical assembly in this case. it has failed.

Contact Nintendo for the optical replacement procedure.