KOS luncher suddenly missing or deleting itself without any notice please help!!!

[royuuki18]

i have a huge problem the KOS luncher deletes itself every time i got server disconnect then i look at, at my files the BAM! the KOS luncher is gone and this happens to for the third time so this time i got mad and don't know what's the problem so i search some info and some info says that some malware is involve and Windows will automatically delete unused files when the computer is low on disk space. Please help admin by the way i look at the trashbin its not there either maybe more like missing than