Hi! , i uninstalled my avast! webrep for google chrome and now i want it back, i opened avast and clicked install again,
after restarting my web browser it is still not there… 
Im using windows XP
Happened to me but a couple more times of restarting Firefox did it.
Try it with Chrome.
If that doesn’t work, try uninstalling and reinstalling Webrep a few times.