Originally Posted by superFLYguyO

How would I go about restoring to say, three days ago?

This is the link to your Intel motherboard D915GAG
http://downloadfinder.intel.com/scri...4&submit=Go%21

first update the chipset No:6 then RESTART your comp, this is what they do
***********************************************
* 1. OVERVIEW
************************************************** **********
The Intel(R) Chipset Software Installation Utility installs
Windows* INF files to the target system. These files outline
to the operating system how to configure the Intel(R) chipset
components in order to ensure that the following features
function properly:

- Core PCI and ISAPNP Services
- PCIe Support
- IDE/ATA33/ATA66/ATA100 Storage Support
- SATA Storage Support
- USB Support
- Identification of Intel(R) Chipset Components in
the Device Manager
It is advisable to update before installing any software
then get the Realtek HD audio driver No:3 from Intel and install

Hope this helps