Hi Tomohawk,
I have a few steps for you to consider to get back to ArgonathRPG SA:MP.
First, Check that you have installed any / all updates for your windows operating system, this includes service packs if there are any that you have not installed.
Secondly, Uninstall SA:MP and re download it from here:
SA:MP 0.3 R3 Client DownloadI would in the meantime, also reinstall GTA San Andreas just in case it has affected anything. Make sure that there are no modifications to it.
If all else fails, I would consider whether or not you are using a proper install of the file GTAsa.exe in your program folder.
Good Luck!
Regards, DellStorm