Hi, Sunny.
It is good that you have your Prometric ID and registration information. This information can be mapped back to your MCP ID account.
You can log into http://register.prometric.com. After logging in, click
Update Personal Information to view your email address. Make sure the email address that you have recorded on your Prometric profile is the same email address that you will use to log into the MCP site.
If you can't log into Prometric, call them. Here is the contact information for Microsoft exam candidates:
https://www.prometric.com/en-us/clients/pages/contact-numbers.aspx?client=microsoft
Gather all the evidence you can and then contact your Microsoft Regional Service Center. Their email address is
mcphelp@microsoft.com
You can also call them on the phone. Please use the following web page to find the correct contact information for help.
http://www.microsoft.com/learning/en-us/help.aspx.
Have all your evidence ready. This web page includes email and phone contact information for your geographic location so you can email or call them directly. They will help you get this figured out.
NOTE: This public forum is usually monitored by fellow IT professionals like you and me but not by Microsoft employees.
**NOTE: You may want to remove your personal information from this open forum for security best practices. Especially your Candidate ID and Registration number.
Good luck!
Best wishes, Davin Mickelson