Ummm someone is missing something here :: Paypal website payments standard ::
with paypal standard you do not need a paypal account, you just need to look for the non account payment option
trouble is dependant on clients computer settings and the browser used it does not allways pop up and shout at you
do a few trial orders and look carefully there is an option at the paypal stage that says, paypal account holders or similar, log in here below it says "Don't have a PayPal account?Pay with your debit or credit card as a PayPal guest"
non paypal account holders use credit or debit card (no need to open an account)
Paypal settings not CC so try contacting PP when you see what i mean and they will confirm its a browser issue probably
Do a trial order on my delorean site if you like it is set up with paypal standard
And an afterthought why are you using basic for clients when Pro was designed for multiple shops
the basic you have to change ftp settings and payment gateways between shops, but pro allows each one to save independantly