Maybe there's some file in ur data was deleted, i suggest for you to use CCleaner maybe you got virus on your computer. And try to re-install ur client. download it again and choose HTTP download. Or if you having trouble connecting in game because of MuGuard then please go to your MU Folder > MuGuard > then find llahlog.dat and send it to infinitymu@abv.bg and try to re-install ur OS if that options doesn't work. just try all the options it would be much better 
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