1. BSOD Error Message(s). Was there an additional text string such as "INACCESSIBLE_BOOT_DEVICE"? It also would be nice to have the complete error string; STOP code plus four parameters "exactly" as they appear.
2. BIOS Changes. What area(s) of the BIOS did you modify?
3. Chkdsk. Hold off on that for now. Perhaps we should know more about your hard drive setup and whether any drive overlay software is used for disk volume access.
4. Computer Specs.
a. Desktop or laptop?
b. Make and model number of computer if brand name, otherwise motherboard make and model number.
c. Approximate year of manufacture (basically how old is the system)
d. Hard disk drive(s):
(1) Total capacity, approximately (in GigaBytes)
(2) Interface; e.g. Parallel ATA (PATA) or Serial ATA (SATA, SATA2)
(3) How connected to motherboard, if known; e.g. IDE Primary Master (PM), SATA port 1?
e. CD/DVD drive(s):
(1) Type of Interface
(2) How connected to motherboard, if known; e.g. IDE Primary Slave (PS), IDE Secondary Master (SM)?
Basically I wonder whether motherboard is set up for straight IDE, SATA, or some kind of compatibility mode. And whether any drive overlay software might be involved for large disk access.
5. Windows XP. Home Edition or Professional? What service pack level was initially installed on system and what level is your system currently at (original, SP1, SP2, SP3)?
Is your Windows XP CD Home Edition or Professional and what service pack level is it at?