Problem in starting PGSQL8.1 service.

I modified one of the .CONF files located in the Postgresql\Data Folder. I
just changed the amout of shared_Buffer from 1000 to 100 and Max_Connections
from 100 to 2.

But after that the PGSQL service stopped working. It stopped listening to
the local host. I have installed PostgreSQL on my desktop stand-alone
machine (as a service).

I changed the .CONF files to their default values, but still it stopped
working. Later I had to re-install it to get things work properly.

Please let me know why it happened and how to get rid of this problem.
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