Re: cant download anymore on Chrome
Chrome user profile is likely to be damaged or outdated. Delete existing, you can only store bookmarks, bookmarks favicons and login files. Delete everything else and Chrome does a new one.
Restore the original settings for Chrome. May be that some malicious apps have made there some unpredictable changes.
Usually Chrome doesn't need reinstalling, but You may to do also it, if You want. Usually it isn't never damaged.