Edirol ua-25 disappeared from Sonar 3.1.1 MIDI input and output

I have been experiencing many different problems with my Edirol UA-25 interface. The latest is it no longer shows up in the midi inputs and output in Sonar 3.1.1. I have downloaded the latest divers and followed the installation instruction precisely. I also downloader ‘CleansAll’ recommended by Roland to remove the old driver. I have tried reinstalling the original driver, still no go. I have experienced several different problems over the last week. Before this problem, I could not direct monitor (or indirectly through the output jack in the back) my project. I could input both audio and midi data through the UA-25, but couldn’t hear it. I found some info on the ‘fixya forum’ that showed how to configure the switches. I followed their lead and magically everything was working perfectly. The next time I booted up, Edirol disappeared from Sonar. So, I started the reinstallation of drivers that I referred to earlier. I also reinstalled Sonar. No luck. I have two machines and the problems are always exactly the same on either one.
My setup:
Sonar 3.1.1
UA-25 switches:
Advanced -> off
sample rate -> 44.1
limiter -> off
phantom rate +48V -> off
Play/Rec -> Play
Digital in -> off
Compaq Presario R3000 laptop, 1 gig ram, WXP, sp2
Dell Precision WorkStation 620, 512 Mb ram, WXP, sp2

Thanks Ludvig,
When I get home I'll try this out. I found a user manual online and I will use it. I think many of the problems have been related to not unplugging the unit and changing the switches expecting that to make a difference. As well as not understanding the switches. Plus, it may be time to do a clean install with my OS.
Thanks again,
Graham

Thats good to know, I'll try that, too.
Thanks,
G.