WampServer

I've been searching the Internet all day trying to find what I'm doing wrong here. I want to install pear db. I have ran the pear installer from the command line then installed the db library. After this, I have done a require_once(db.php) and get the following:-

"Warning: dir(DB Error: extension not found) [function.dir]: failed to open dir: Invalid "

This is really doing my head in. I remember I had the same problem last year and I sorted it but I remember finding the steps took ages to do. I added the webpage I used to my faves back then but have suffered a system crash since and lost the webpage plus my old wamp/pear db installations. Is there a step by step guide somewhere that I haven't been able to find or can anybody please advise me what to do next?

Thanks in anticipation of somebody putting me out of my misery.

Ahhh no matter. I've sussed it. Spent 3 days puzzling over this then as soon as I ask for help I figure it out 10 minutes later.

So what's the solution?

The include_path directives in my php.ini file weren't set right. When I looked at it they looked right but the reason for this was because I was looking at the incorrect php.ini. There were 2 on my machine and the one I was working with wasn't the right one. I just stumbled over it when I did a phpinfo() and it dawned on me. A really silly mistake to have made but now that I've sussed it I remember that was also what happened last year.