Juker's problem sounds more like database pruning and not a virus.
Go to the Admin panel>Settings>Database pruning>Clean old profiles by last log in ( days ) and set it to something like 3000 otherwise it will delete your older profiles automatically.
Go to the Admin panel>Settings>Database pruning>Clean old profiles by last log in ( days ) and set it to something like 3000 otherwise it will delete your older profiles automatically.
Hope that helps.
Prof.