Try updating your BIOS. If you do like it says with running MSINFO32 you'll get a screen like this (I've put a box around where it says the make and model number of your mobo)
Find the manufacturer website and follow the instructions to upgrade your BIOS.
If that doesn't work, the date resetting makes me think it might be the CMOS battery dying. If you crack the case, it's just a normal flat battery, like this:
Other than that, virus/trojan? You got scanners and things all updated and a scan done?