well, more information...
I have now tested with the following versions of BB Desktop Software: (these version #s are from the about box) 184.108.40.206 = OK 220.127.116.11 = OK 18.104.22.168* = NOT WORKING *note that 22.214.171.124 is what you get when you install the "126.96.36.199" package which is the latest version as of this writing.
I did a string search of all the files in the RIM directories in Program Files and Common Files and found that the dialog box is contained in: C:\Program Files\Research In Motion\BlackBerry\product.dll
I confirmed this using a program called XN Resource Viewer. The working (i.e. non-annoying) versions of BB software do not even contain the offending dialog box in the product.dll file. So for now I have settled on using the 188.8.131.52 software (which is actually called "184.108.40.206" on RIMs download site)
HELLO RIM DEVELOPERS- PLEASE REMOVE THIS QUITE USELESS AND ANNOYING DIALOG BOX AND REMEMBER... IF IT AINT BROKE DONT FIX IT