We've had a few customers with problems paying with paypal, below is some information from a Google search. What I have found that has worked was clearing your cookies and cache file in Internet Explorer. Another fix to the problem is to use a diferent web browser. Google Chrome I think is a great alternitive to Internet Explorer. You can get it here www.google.com/chrome
From an Ebay Message board
There is an error message that buyers sometimes encounter when attempting to make a PayPal Payment.
Something to the effect "Error:Unable To Process This Transaction" or "Unable To Complete Payment"
or "Unable To Proceed, Try again Later"
The wording may be a little different, but the message is essentially the same.
We have some first hand experience in this area, when buying (yes we are also buyers).
The advice which will be given first mention here is;
Contact eBay Customer Support (or Live Help)
( Felt obligated to say that)
AND contact your seller. (VERY IMPORTANT)
* A seller has no way of knowing when a buyer is experiencing such issues, unless they hear from the buyer.
What We Have Found To Work:
When we've encountered this error while shopping on eBay, we bypassed the eBay checkout and logged directly into our PayPal account.
Near the top of the page, there is a "SEND MONEY" Tab. Directly under this, there is "Pay for eBay Items".
Clicking on that, should pull up ALL the purchases you have on eBay that are not yet paid.
You can then select the one you would like to pay and complete your transaction.
* Sometimes clearing the cookies on your computer will also solve the issue, if it is a cache problem.
* It may be best to clear cookies and then restart your computer.
* We've noticed that once in a while, this spontaneously clears up on its own without the buyer or seller doing anything at all.
One common misconception ... some buyers automatically assume that the error message means there is something
wrong with the sellers account.
Unless the error message specifically says so, there is probably nothing wrong with the seller's account at all.
Credit Card Cannot Be Used for PayPal Payment Error
The issue is little tricky because the rejection may happen with credit card which previously accepted and worked properly, then suddenly stopped working, or worse, payment will not be accepted even if user changes or switches to any other credit cards.
There are many possible causes that can result in such credit card rejected error, and PayPal doesn’t give specific explanation on how to resolve the problem and make the payment goes through processing again, with the same or different credit card. Here’s some explanations and possible resolutions that suggested by users on Internet.
Credit Card Is Linked or Associated with a PayPal Account
Many believes the credit card is not accepted by PayPal when using it not signing into PayPal account is that the credit card is already been used in a PayPal account. If you’re using a credit card that’s linked or assigned to a PayPal account, try login to PayPal during payment process. You can change the source of fund to make the payment after logged in to use credit card instead of PayPal balance.
Credit Card Is Previously Used in PayPal Account or Assigned in Closed PayPal Account
PayPal remembers a credit card details even when it’s already been removed from the account. The information also been remembered even if PayPal account which linked to the credit card is closed and deleted. In this case, try another credit card, or assigned the credit card to a PayPal account, and pay with account logged in.
PayPal Limit on Non-Member Credit Card Usage
According to PayPal source, there is a limit based on the number of times, the amount of the transactions, the type of merchandise being sold that a credit card can be used within the system without having to verify ownership by opening an account. The restriction is for security and fraud protection reasons. There is no workaround to this limitation, but you should be able to use another credit card. If there is problem, try using another email address. Else, register an PayPal account.
Credit Card or Email Address Raises Flag in the Transaction
Closely link to reasons above, where some part of the transaction raises flag on the server that stop the payment. Two possible flags are on credit card or email address. Try changing either credit card or e-mail address or both when attempting to pay again.
Try using another web browser and/or delete cookies and attempt to pay with PayPal gateway using credit card again.
Credit Card Is Not Confirmed in Account
Contrary to some of the reasons above, if the credit card has been linked to an account, but not yet confirmed, try to complete all credit card information such as Card Verification Number or Security Code, and confirm the card by entering the PayPal code shown on the credit card statement on special refundable charge by PayPal.
In all case, the problem won’t arise if you add the credit card to PayPal account, and use it as funding source to pay the transaction through PayPal account.