Basically, I have the EXACT same problem as...
Just purchased it, installed and immediately downloaded the 1.41 patch. Can't join any servers, always says I have an older version than the server I'm trying to join. It says it installed but it's not showing up in the top right.
Specs incase needed: 2.80 GHz Pentium D processor 1GB of RAM Nvidia 6600 GFX card Windows PRO
The elusive Member 132837.
23rd December 2005
Have you tried restarting your computer since you installed the patch? You may have already done that but just checking :)