I noticed you posted in the Vista ISP download thread a few weeks ago. If you've recently performed a clean reinstall of Vista SP2 you'll have to pre-install all six speedup patches listed in STEP # 2 of the instructions in m#l's thread.
As SIW2 mentioned above, Torsten Wittrock's WSUS Offline Update tool can also be used to download and install important security updates for Vista SP2 (see the Legacy tab of the interface) and other Microsoft products like MS Office. See Note 6 of the instructions in m#l's thread.
----------- 32-bit Vista Home Premium SP2 * Firefox ESR v52.0.2 * NIS v184.108.40.206 * MBAM Premium v2.2.1