I have an X but I was having download issues before. One thing that was suggested to me was to download astro file manager and in the options select allow browser downloads. What worked for me was downloading dolphin hd browser and setting it as default browser
I've never set it in Astro and download files with the stock browser all the time.
I hated Opera Mobile as well, it was a lot slower then any other browser, even my outdated Dolphin Browser (Which I haven't updated since they took out the Youtube Download capability back in the original launch).
To the OP: It could be all sorts of things. I know if your connection is a little flaky it won't download files, but you need to give us much more specific information if you want help, such as:
Are you getting any errors?
Are you trying to download an app, or a file from the web?
Are you trying to download a file from within an app?
What is the specific file you're trying to download?
Things like that, with the little bit of information you've given, there's not much we can tell you beyond the generic "make sure you have a good signal".
Well okay I can get it from the internet and install it on my droid but when u open to app u download it again cuz the game need so many bites for the game... the game I'm getting is madden 2011 and it has a lot of graphics but the prob is it won't download evn in full wifi and on airplane mode. It keeps saying retry over and ovr cuz it failed. I have uninsalled it and re installed it still the same problem. Is that more in detail?