BIOS settings after "load optimized default"

Hello,

I will explain my problem as best as I can... My desktop computer running Windows XP had a sound card issue... (no mixer anymore...) so I searched for a solution on this forum. One of the suggestions was to check in the BIOS to ensure the sound card was enabled.
I accessed the computer's BIOS and made the wrong move by selecting "load optimized defaults"...
Since then, my computer won't start. It keeps rebooting at the Windows startup...
I still have access to the BIOS and safe mode with all my data!

Could this be a conflict issue (like drivers/peripherals) or a problem with the BIOS settings...

I can provide the settings of my BIOS if that's necessary...

Standard CMOS features:
date fri aug 6 2010
time 10:55:11

IDE primary master [pioneer DVD-rw dvr-]
IDE primary slave [hl-dt-stdvd-rom gdr8]
IDE secondary master [none]
IDE secondary slave [none]
IDE third master [none]
IDE third slave [none]
IDE fourth master [none]
IDE fourth slave [st3250310as]
Drive A [1.44M, 3.5 in.]
halt on [all errors]

Cpu features
Intel speed tech --enabled
delay prior to thermal --16min
limit Cpuid maxval --enabled
ce1 function --auto
execute disable bit --enabled

boot sequence
1st floppy
2nd hard disk
3rd ls120
other --enable

advanced bios features
boot sector protection --enabled
hyper threading function --enabled
quick boot --enabled
mps table version --1.4
boot to OS/2 --no
full screen logo display --enabled

advanced chipset features
system bios cacheable --disabled
video bios cacheable --disabled
memory hole at 15-16M --disabled
VGA setting
peg force x1 --disabled

Integrated peripherals
USB controller --enabled
USB 2.0 controller --enabled
USB keyboard --enabled
USB mouse --enabled
Azalia/ac 97 audio select --enabled
onboard intel LAN --enabled
onboard LAN boot rom--disabled

io device configuration
onboard Fdc controller --enabled
com port --auto
onboard parallel port --378/irq7
parallel port mode --ecp
ecp mode use dma --3

IDE devices configuration
IDE hdd block mode --disabled
pci IDE bus master --disabled
on-chip primary pci IDE --enabled
IDE primary master pio --auto
IDE primary slave pio --auto
IDE primary master udma --disabled
IDE primary slave udma --disabled

data devices configuration
on-chip serial ata --enhanced mode
sata port speed settings --disabled

power management setup
acpi function --enabled
acpi standby state --s1(pos)
video off in suspend --no
power button function --power off
restore on ac power loss --off

pnp/pci configuration
init display first -- PCI slot
pci/VGA palette snoop --enable
pci slot 1 ir. Assignment --auto
pci slot 2 ir. Assignment --auto
pci slot 3 ir. Assignment --auto
maximum playload size --4096

h/w monitor
chassis intrusion detect --disabled
legend thermal control --disabled

cell menu
CPU ratio unlock --disabled
dot 3 step0 setting --disabled
auto detect pci clk --enabled
spread spectrum --disabled
CPU fsb frequency --100
pci-e frequency --100
CPU voltage --by CPU default
memory voltage --1.8 v
agp/pci express voltage 1.5 v

That's the BIOS settings... I imagine if they are fine then we need to look elsewhere... I would like to point out that when I turn it on my BIOS only beeps once. The one that indicates "everything is fine..."

Thank you all for your valuable help!