Security Alert This File Contains Encrypted Macros...

I just loaded Excel 2007, and then opened a workbook I wrote that made pretty extensive use of macros and code. I knew enough to first set up Excel via the "Trust Center" to allow ALL macros to run, against MS's, or more likely against MS's lawyer's, recommendations. btw, does anyone have a clue as to what "Trust access to the VBA project module" is all about? Apparently MS doesn't, for I have searched Help and the KB for it in vain. Anyway, I brought the old xls workbook in, then saved it as a macro-enabled spreadsheet, .xlsm. Then I open it, and uhg, a most distasteful surprise. Even though I specifically went in and set Excel to run all freaking macros, someone at MS has decided I am too stoooopid to make this decision, and all macros have been automatically disabled. OK, so let us click where it says "Options" on this warning bar.

A window pops up telling me that this file contains encrypted macros that have been disabled...". Do a search on that, again, MS, MS kb, even Google, and you are not going to find it (In quotes). There is ONE freaking option with a radio button now, telling me "Help protect me from unknown content" - again, I try a Google search, an MS search and an MS kb search... nothing directly addressing it; but I do the logical intuitive thing - there is a selected radio button there, so click it to unselect it. Click the idiot thing until the cows come home, darn it, it won't do a thing! I even tried an Alt-p as they have the "p" underlined - all that does is select the statement, it remains selected, tap the space bar, hit the space bar, stand on the space bar... First they disable all the macros. OK, I can live with going in and fixing that, but then deciding that I am too dumb to make that choice so don't allow me to turn them on in my own freaking code? Yes, it has been several hours and I am still pissed off beyond belief.