Q: iTunes won't burn my CDs anymore and it's slowing down my computer

I was trying to burn a CD earlier and iTunes was displaying a "Disk burner or software not found.." message. iTunes has been giving me a lot of problems lately and I don't know what to do. I tried to run diagnostics but the iTunes Help page is refusing to load and this is beginning to get very frustrating. I recently had to uninstall and then re-install iTunes because it kept crashing and now I'm at a loss. I'd like for this problem to be resolved as soon as possible. My whole computer is being affected by this.

Thank you.