That sounds weird, never had that and i have used it for years. It use 0% cpu, and 19Mb RAM. You can exit it anytime you want from the systray icon, and you can decide if you want it to start on Windows startup or not. I don't see why not, it is important chat client for me at least.
There shouldn't be any issues uninstalling. But not in a million years would i want to uninstall it, with all 71Gb of game downloads i would have to do again.
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