Irritable Bowel Syndrome Message Boards | errors can anyone explaine..

my computer has been acting funny and on this site I got these errors and I can't view whose online I get a screen with no one showing up and an I cursor like you're about to type and you don't get an arrow mouse so you can click on anything.

SQL ERROR: Unable to do_query: REPLACE INTO w3t_Online (O_Username,O_Uid,O_Last,O_What,O_Extra,O_Read,O_Type) VALUES ('aperson','9068','1180420497','online','','','r')
Can't open file: 'w3t_online.MYI' (errno: 145) Message Boards ' Search ' My Home ' Who's Online ' Technical FAQ ' Logout ' Mark all read

SQL ERROR: Unable to do_query: SELECT t1.O_Username, t1.O_Last, t1.O_What,t1.O_Extra,t1.O_Read,t2.U_Status,t2.U_Visible,t2.U_Extra1,t2.U_Title,t2.U_Color,t2.U_OnlineFormat,t2.U_Number FROM w3t_Online AS t1, w3t_Users AS t2 WHERE t1.O_Username = t2.U_Username ORDER BY t1.O_Last DESC
Can't open file: 'w3t_online.MYI' (errno: 145)
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\InetWebRoots\helpforibs.com\wwwroot\messageboards\ubbthreads\mysql.inc.php on line 157

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\InetWebRoots\helpforibs.com\wwwroot\messageboards\ubbthreads\mysql.inc.php on line 130
SQL ERROR: Unable to do_query: SELECT O_Username,O_Last,O_What,O_Extra FROM w3t_Online WHERE O_Username LIKE '-ANON-%' ORDER BY O_Last DESC
Can't open file: 'w3t_online.MYI' (errno: 145)
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\InetWebRoots\helpforibs.com\wwwroot\messageboards\ubbthreads\mysql.inc.php on line 157

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\InetWebRoots\helpforibs.com\wwwroot\messageboards\ubbthreads\mysql.inc.php on line 130

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