"I just can not seem to grasp the software relationship between my dialup adapter and my wlan card in Windows. Not a programmer here, so I'm hoping that you guys might have some ideas."

A problem develops as people create non-mainstream configurations. I know a lot about routers, routing, LANS and more, but will not fix your configuration. I will however note what tools I would use to figure out what is going on and must note that YOU as the creator of this LAN get to fix it.

If this upsets you that I will not provide a direct answer (also known as fish), then read no further. In this case, I can only teach fishing.

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There will be two possible issues.

1. A DNS issue.
2. A routing issue.

In item 1, the DNS is not clearly known to me in your setup. Why it's an issue and a possible cause is that when the dialup connection is made, then a DNS is now available and name resolutions will occur. To see what state the DNS entry is at, open a command window and type... IPCONFIG /ALL

For item 2, open a command window and type ROUTE PRINT Collect the ROUTE PRINT from working and non-working states and you may find why it doesn't work.

Bob