Whenever I start any downloading it stop on 99% and never completes. I changed my download manger and stopped firewall, but all in vain. Problem contiunes to persist. What is causing this problem and what is the solution?
I just ran into this last week, they would get to 99% and then "fail", or just sit forever. As Daniel Hicks suggests, it was the Anti-virus.
I found that if I went and renamed the .partial files Internet Explorer makes, the files actually worked fine.
Disabled the anti-virus and files started downloading fine. Replaced it with a different (newer) AV product and they've been fine since.
So, perhaps try temporarily disabling or uninstalling your current AV package.