Hello Rokinreg, welcome to Intel Communities and thanks a lot for posting your inquire.
These are some recommendations we can give you for this behavior however bear in mind that this chipset supports Windows XP and Vista only. The support for Windows 7 is what we called AS-is.
Please check this page for additional information http://www.intel.com/support/motherboards/desktop/sb/CS-008326.htm
So, you can try to install the latest BIOS using the recovery method http://www.intel.com/support/motherboards/desktop/sb/CS-023360.htm
You can also try to install the Operating system from scratch, in order to update the processor information.
Remember that Windows 8.1 requires features like UEFI and secured boot and this motherboard do not comes with this kind of characteristics.
ensure that your CPU pins (lga contact pads) are clean, and if you have a bios version that supports it.
Windows 8 only requires a 1ghz cpu, 2gb's of ram and HPET class system timer. another requirements are optional.
remember: Windows has a microcode update utility, probably Windows failed to hot-update it, try to install an older version of Windows 8, and try to reflash that bios. some bios version update another firmwares too, read release notes carefully, degrado to that version and then update to last.
sylvia_intel, I have installed Windows 8 in systems with very old intel motherboards like d945gnt, and i didn't noticed any problems.