Why won't my flash player work anymore?

In the last 2 months I have not been able to view any thing online that uses flash player. I have uninstalled and reinstalled the flash player several times, and it didn't work. After I reinstalled it, it says it's installed, but doesn't work. I have gone to the flash player problem area on... show more In the last 2 months I have not been able to view any thing online that uses flash player. I have uninstalled and reinstalled the flash player several times, and it didn't work. After I reinstalled it, it says it's installed, but doesn't work. I have gone to the flash player problem area on adobe's web site, and followed all of the steps. Nothing has worked. What can I do?
Update: No new fire wall or proxy server.