549732 To fix website made with Drupal 7.12 and e-commerce module

I made website with Drupal v.7.11 and "Lite Commerce" module, Core version: 1.0.16 After "LiteCommerce" update, and Drupal update to v.7.12 something happened, and webpage is not showing correctly to visitors. I see, what "Lite Commerce" Admin is working correctly, but in Drupal 7.12 Admin zone main admin meniu links are broken (showing some errors), page not found. Can anybody fix, or maybe reinstall Drupal without damading filed info in data base?