Okay, here's an update...

I gave up (temporarily, at least) on installing the UFASoft driver because my anti-virus (Avast) tells me that it is infected with a virus (BitCoinMiner-AI [Trj]) if I attempt to download it. Now, that's probably normal and just fine, but when my anti-virus program complains, I listen.

I wanted an alternative, so it was at that point that I noticed that my earlier loading problems occurred because GUIMiner was seeking something in a sub-folder named “miners.” I further noticed that there was already a folder in there (puddinpop). So I created a new miner with File / New miner and defined it to use the executable at ...\miners\puddinpop\rpcminer-cpu.exe

I then completed the tab by filling in my BTC Guild user name and password. I did not touch CPU Affinity since I only have one CPU! I then clicked on the Start Mining button.

Connecting...
Connecting...
Connecting...

The Console log showed this:

2012-11-05 11:12:36: Running command: C:\Test\1\GUI Miner\miners\puddinpop\rpcminer-cpu.exe -user=TimXCampbell -password= -url=http://btcguild.com:8332
2012-11-05 11:12:37: Listener for "TimXCampbell_1" started
2012-11-05 11:12:38: Listener for "TimXCampbell_1": Client will start 1 miner threads
2012-11-05 11:12:38: Listener for "TimXCampbell_1": Work will be refreshed every 4000 ms

Connecting...
Connecting...

I tried opening up port 8332 on my firewall (Windows XP, by the way) and stopped/started the miner. Nope.

This doesn't exactly work right out of the box. I'll keep experimenting.