What should I do to these BIOS settings? Just built my first PC.

Here are my present BIOS settings. They're all currently set to default, since I initially tried to screw around in my BIOS and ended up unable to connect to the internet (followed by a failure to boot windows, which was scary -- luckily, however, Windows Repair did a system restore and I managed to boot again, although I had to reinstall my motherboard / video card drivers... Again, what a relief.)

Here are the settings of what I thought to be important. My BIOS is simple and doesn't really seem to have many functions, but here are most of the ones I didn't comprehend (I.E. I didn't list things like "beep when windows boots successfully"):

Note: All of the settings below are changeable.

-PCI SUBSETTINGS-
PCI ROM Priority (what the heck?)
PCI latency timer (32 PCI bus clocks, but it's clockable up to 248)
VGA Palette Snoop (Disabled)
-No Snoop (Enabled)
-Max Payload (clocks up to 4096 BYTES ((not megabytes, it just says "bytes")). Changing this setting might've been what caused all the trouble mentioned above, but I don't really know for sure.)
Max Read Request (Again, this scales all the way up to 4096 byes. This also might've been what caused the headache mentioned above. I don't really know, though. Now it's at the default, just like Max Payload.)
ASPM Support (Disabled)

-BOOT-
Setup prompt timeout (2)
GateA20 active (upon request)
Option ROM messages (forced BIOS)
Interrupt 19 Capture (disabled)
BIOS flash protection (enabled)
UEFI Boot (disabled)

-PERFORMANCE-
fixed CPU ratio (disabled)
enhanced intel speedstep technology (enabled)
CPU C1E (enabled)
DRAM timing control (by SPD)

I clocked my memory up to 1333 megahertz, which is its maximum speed.

So, what settings need to change? Any help would be greatly appreciated. I'm extremely timid right now.