Chrome (28 stable) and IE10 (with all updates from WU).
When I need chipset and IME drivers I always go to Intel's download center, type in the query ("Intel management engine" and "Intel chipset device software"), select the OS I need them for, and download the latest versions.
Can you now use the center properly? Does it display any returning results after executing a query? Even if I simply type "Intel" or "Driver", nothing can be found...