Hi robb. Sorry to hear what happened. You can still recover your account but first of all I recommend you install malwarebytes and run a scan along with a good antivirus to get rid of all the nasty stuff. Otherwise if there is a keylogger what you do afterwards is of no use.
Anyway afterwards, check these links out:
services.runescape.co_m/m=forum/a=13/c=cqh80rCpW6U/forums.ws?367,368,0,65296702
services.runescape.co_m/m=forum/a=13/forums.ws?367,368,3,65337839
services.runescape.co_m/m=rswiki/en/Contact_Us
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You can also recover your lost items provided you meet certain requirements but first try and recover your account.