cannot see customer details

[Kalpesh]

Hello

I am using 1.2.5.0 presta, but i am facing an isue with the admin panel when i login to admin panel and click on the customers tab where we can see the list of customers but on clicking i cannot see the details the page becomes blank.

Also now i am recieveng a validation link in the mail after registration but this was not done before... i deleted the validation link from accounts.txt and html and now i am recieveng error on clicking the products in frontened ,saying you cannot access t