I have installed postgreSQL in my pc.
Unfortunately, it doesn't connecting database.
Now, at my reinstalling, the same problem occurs. This can be solved by cleaning registry.
Can I clear it manually ?
A word of warning: Be very careful with editing the registry! It may turn your Windows installation unusable pretty fast.
Now that this is out of the way:
However, I agree to Mehper, that you should first find out what to change exactly before just digging through the registry.