After upgrading to Windows 7, I’m unable to view List’s in Datasheet View.

Error:
The list is displayed in Standard view. It cannot be displayed in Datasheet view for one or more of the following reasons: A datasheet component compatible with Windows SharePoint Services is not installed, your browser does not support ActiveX controls, or support for ActiveX controls is disabled.

Solution

I was running IE 8 (64 bit), when I tried editing the list in Datasheet view with the 32 bit version, everything was back to normal.

It appears a 64 bit version of Office will be out for the 2010 release.

http://arstechnica.com/microsoft/news/2009/04/confirmed-office-2010-will-come-in-32-bit-and-64-bit.ars