Hdd deteched on BIOS but weird on windows

hi guys, i dunno where is right section for this kind of questions... so i just decided to ask here.

i just built my computer for the first time, and it seemed slower than it should be.

so i was checking stuff and when i was looking at total space from :my computer: it says 127gb.

although it should be 800 gb. so i checked on BIOS for hdd drive, it detects HDD on SATA 1 for 800 gb.

so i checked on windows again, it still says my C: total size is 127 gb and didnt recognize any other drives.

i installed windows XP and i didnt seprate partition.

and when it asked for format before install, i said to do fast format. is that possibly why?

Please help.

AMD Athlon II X2 245 Regor 2.9GHz 2 x 1MB L2 Cache Socket AM3 65W Dual-Core Processor (Model: ADX245OCGQBOX)
ASUS AM3/AM2+/AM2 AMD 785G HDMI Micro ATX Motherboard (Model: M4A785-M)
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM 1066 (PC2 8500) Dual Channel Kit Desktop Memory (Model: F2-8500CL5D-4GBPK)
Western Digital Caviar Green 800GB 5400 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive (Model: WD8000AARS)
LITE-ON Black 24X DVD+/-R 2MB Cache SATA DVD Writer w/ LightScribe Support (Model: iHAS424-98)
Rosewill Black ATX Mid Tower Computer Case, come with 1x 80mm Fan (Model: FB-02)
Rosewill 600W ATX12V v2.2 / EPS12V SLI Ready Power Supply (Model: RV2-600)
ASUS EAH4870/2DI/1GD5 Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card

this is my parts if thats needed. thank you in advance
2 answers Last reply
More about deteched bios weird windows
  1. as i would do, screw the old drive, get a new one, but not everyone wants to do that i know... reformat it SLOWLY and try again?
  2. i fixed it, it was because my xp was old. xps can only detect 140 gb before sp 2. :)
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