On Linux, I avoid Flash-on-YouTube as a side effect of avoiding streaming video in general; I invariably download it locally first, using either youtube-dl or cclive. If anyone else would find that a viable approach (unlikely though that seems), they're command-line tools which should work on Windows just as well as on Linux.
youtube-dl is Python-based, and so requires a Python interpreter, but that's readily available from python.com.
cclive is written in C++, and although it has some mildly esoteric dependencies, from the looks of things they're bundled with the Windows version; you should be able to install and have it Just Work. It's not quite as user-friendly as youtube-dl, though, in that it won't pick the best-quality format automatically; you have to specify it by hand. On the flip side, it also works for some sites other than YouTube itself.
Either can be readily found by Googling on its name.
YMMV, but if anyone finds that useful...
youtube-dl is Python-based, and so requires a Python interpreter, but that's readily available from python.com.
cclive is written in C++, and although it has some mildly esoteric dependencies, from the looks of things they're bundled with the Windows version; you should be able to install and have it Just Work. It's not quite as user-friendly as youtube-dl, though, in that it won't pick the best-quality format automatically; you have to specify it by hand. On the flip side, it also works for some sites other than YouTube itself.
Either can be readily found by Googling on its name.
YMMV, but if anyone finds that useful...