I found the solution to the error 492 friends, at last, after so many things I've done, and the solution ess so simple, no need to format anything, not flash the phone or anything, well I explain what Realize my samsung galaxy ace GT-S5830L ...
1.Settings
2.Applications
3.Administrar applications
4.Downloads (top left next to All)
Uninstall updates "Download Manager"
"Com.sec.android.providers.downloads"
accept and go ...
Because these updates are automatic the android system are in shock, as if we would have discharged us, but it is not so ... I had those two who are with the logo of android, there may be other more, I think it is "provider of search applications," also uninstall the updates, I did it long before, but nothing more important is the two above-mentioned .... if you served them comment I am very happy to regain google play, update and download programs smoothly ... a hug.