Here are a couple of things to try...
First, get rid of any trace of the
Rival...uninstall, then do a search and get rid of any files there...then do this...
Go to START
Then RUN, type in regedit, then OK
Click the + on HKEY_LOCAL_MACHINE
" " " on SOFTWARE
" " " on MICROSOFT
" " " on WINDOWS
" " " on CURRENT VERSION
" " " on App Paths
As you look, alphabetically, any
Rival Casinos you've ever downloaded should be listed. Right click on the casino name, and delete.
This gives you a truly clean slate to start over.
Chances are now that you have an anti-virus application that is preventing the Rivals from either downloading, or downloading soooooo slowly it never ends, or messages about corrupt files and what not. If your anti-virus has a snooze feature, use it before attempting another download. If no snooze, disable all anti-virus stuff before downloading.
The above is what got me playing again after having the same problems as you seem to. Hope this helps.