I installed Visual web developer 2005, ajax extension, etc...
1.
Now when i created a new website and added existing db ( i use access DB ) to App_Data folder i get this error:

2.
When i try to create a new access data source i get this error:
Object reference not set to an instance of an object.
Funny thing is, that a few months ago, before i bought a new computer, i didn't had this problem.
I also made uninstall, and new install, but still same problem.
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1 thing though.... I have a backup of my previous website that i had on
my old computer. when i copied it to a new computer, i had the same
problem, even though it ran on the old one.
Thanks,