I want to purchase, however once I proceed to check out the website does not accept my User ID and Password.
The customer details you are being asked for are actually those for an account with Element 5 - our order processing partner. Account details at www.parallels.com will not be accepted, as being separate registration.
You can either proceed with the purchase as a New Customer - there will be no difference in price or anything else.
You can request your account details from Element 5:
Click here for information
Element 5 Customer Service Contact details: