So you did not back up your databases or client which worked before reformatting your computer.
Now that you have reformatted you needed to start from scratch, and something that you did to make it work right before you did not do this time, and you can not remember exactly what you did before?
Does that pretty much sum it up?
I am sorry but I work with 8.1 but the following topic may help you with the 6.2 client stuff...