lost payment method

[stevennestler]

I seem to have gone backwards with the latest download  (RC-3). I had been able to use PayPal; now I have no payment method. When I try to configure, I
receive this: Fatal error: Class 'vmPaymentPlugin' not found in .../plugins/vmpayment/standard/standard.php on line 25

I'm too new at this to know what to do. Please help.
Thanks,
Steven