I know this thread is old now. This is currently the latest driver by Intel for the HD 4000. And it solved a flickering issue I was having. To help with people searching, I put the link and details here.
File name: Win64_153117.exe
Size:136.11 MB Language:Multi language
Operating Systems:Windows 7 (64-bit)*, Windows 7 Enterprise, 64-bit version*, Windows 7 Home Basic, 64-bit version*, Windows 7 Home Premium, 64-bit version*, Windows 7 Professional, 64-bit version*, Windows 7 Ultimate, 64-bit version*, Windows 8, 64-bit*
That is the file I downloaded. Here is a link, It is for the Iris and HD series. Also for the latest 4th gen core series. I would make sure you have something actively running on the Intel grphics before installing this.http://