problem installing NPGSQL and pgOLEDB with .NET

I have PostgreSQL 8.2 installed on Windows XP. I installed NPGSQL driver for
.NET and tried to register it's dll with following command:

regsvr32 c:\windows\system32\npgsql.dll

It displays error: "Could not be registered, entry point not found".

I copied the NPGSQL driver files in application folder, but when I open
VB.NET and attempt to ADD REFERENCE to it, VB.NET displays an error saying:
"A reference could not be added.". How to add reference to this driver?

Alternatively, I tried pgOLEDB. It got registered with regsvr32 but when I
try to create connection string, it does not connect to the postgres
database. It displays following error:

[Test connection failed because of an error in initializing provider.
Unspecified error.]

I am left with the normal ODBC driver. It is working. Please also let me
know which driver delivers best performance.
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