I tried to ran sdk 32 BIT for andriod in windows 7 and I got error message
Failed to fetch URL http://dl-ssl.google.com/android/eclipse/addon.xm reason: Unknown Host dl-
I had the same issue before. You can download a zip file of the components you need and manually install them in Eclipse. Follow this link -
https://developer.android.com/sdk/installing/installing-adt.html#Troubleshooting