Pages Not Found

Google webmasters lists that around 3000 unreachable urls are there in my website. And all are related to NGGGallery.

One eg url is

https://www.bikes4sale.in/wp/page/70/?album=fzkwxfaqye&pageid=492&pid=250&nggpage=2

If we click on any of the image, i am getting Page Not Found msg.

I think this happened when i upgraded to 1.7.3 or 1.7.4. Not sure about the version.

Any help would be appreciated.