Ok, no worries. Let’s take it one step at a time.
1. Start with a fresh, clean RS u der Steam. Get rid of the thing and re-download through Steam. We want to get rid of any invisible hiccups.
2. Make sure RS runs normally.
3. IF it does, run the latest installer for PC. If you get any guff about viruses you’ll just have to swallow hard and go ahead. (If you can’t proceed at this point, let us know.
4. Repeat step 2.
If you get past step 4 we’ll worry about CDLC next.
Sorry about the pedantry, but it’s the best road to success….