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Open C:\RCCWork\NPCClient_Ch1\_NPCAccount.xml and change the password to whatever you are using now.
The default password is in the tutorial, but I somehow glanced over that part, you probably did...

Scanning my computer right now, nothing so far, C: drive done, my Windows folder is also clean, I checked twice.
Server files also seem to be clean for me, and so far no one else had any problems...

For some reason, both files are corrupted for me, am I the only one with that problem?