I can't get my computer to play msn or pogo games even though I used to be able to. How can I fix it?

The screens open to the loading page but never open the game. On MSN it will say game loading in 0 seconds and never open up. On Pogo it just stays on the advertisement. I have tried deleting temp. files, disk clean up, defragmenting, and disk scan. Sometimes on Pogo the type font changes and an x appears where pictures should be. Sometimes when I download games from MSN it will stop halfway through and say not a win 32 app.