I am having serious problems in Configuring ADT with Eclipse. I am using Windows 7 Home Premium version.
The Eclipse (64 bit) that I am using is:
Ecl
I had this too and just solved it. For me, it turned out that I didn't have all the libraries like the tools package.
Other things to keep in mind that helped me overcome related errors:
1) When giving urls from where to download, if the https doesn't work, try http
2) Run your eclipse as administrator if u r running it from Windows 7 - that will help you avoid permissions problems.