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To all WINDOWS VISTA users:
After you have
download the game
installed/patched the game outside Program Files
open all the PORTS needed (port forwarding)
unblock the game from the firewall
here's the next thing you should do:
go to League of Legends folder -> search for "lol.laucher.exe"
right click and choose "Properties"
then go to tab "Compatibility"
and put a CHECK mark on "Run this program as an administrator"
then click OK
repeat these steps in the "LolClient.exe"
League of Legends folder -> air folder -> LolClient.exe
and in the "League of Legends.exe"
League of Legends folder -> game folder -> League of Legends.exe
if you are able to do these steps
then you should be able to run the game in no time!!
Note: posted below are some screenshots for your reference