It's somewhat peculiar that the Intel driver shows an August date at HP, but an April date on your system.
However, as you say, although the 2119 version is within the range to be avoided, it wouldn't appear to be directly related to your issue.
Have you considered uninstalling KB2454826, uninstalling your Intel graphics driver, and then reinstalling them---preferably through fresh downloads?
I did download an Intel HD graphics driver from Intel, but I did not install it. I also used the utility you mentioned and it referred me to Gigabyte as it referred you to HP. The Intel driver is dated Jan 7, 2011.
Looks like there are even newer drivers: http://downloadcenter.intel.com/Sear...AE+HD+Graphics
It may be that HP is behind the curve and simply is not updating drivers rapidly.
I'd guess you have an Intel H55 chipset?
But I am just guessing here and have no particular further advice---other than I would personally try alternatives subject to System Restore points if I couldn't get SP1 to show up in WU within a day or so. It ain't right, for some reason.