Hi, You can try the long way here :
or simply use MWANG fix by loading this ROM to your phone
this will downgrade your phone...
This is a full downgrade guide check it out
and when you connect your phone to your PC your pc will install the phone as a storage only so you need to instal...
Is your working?? is ur problem the market or the google account login??
if its the market then find this file and update it (gapps-mdpi-tiny-20101020-signed_2.zip)
if it is ur google account try to make a new one no need to use anybo...
It could be a slow internet connection try to find another internet provider