I've noticed this problem on all PCs that have been upgraded from Windows update to Microsoft Update. Before upgrading, it was like 2min max to get the list and with MU, its now upwards of 5-9 minutes! Going to administrative options and reverting back doesn't make the problem go away, either. I know its also scanning for Office updates too but in the time it takes MU to scan it, I could've got a list from WU, manually visited OU and cut my lawn! This is a pretty severe problem and wastes a lot of people's time. Its hell on patch tuesday at work since we're poor and don't have a WSUS.