Solved How to fix "Error Loading Operating System"

Go into BIOS by pressing (F2 or whatever key your system accepts for entering Bios) and select the boot options.

Make CDROM/DVDROM as first boot device.
Make Hard disk as second boot device.

Ignore other boot devices. Save settings while you quit the BIOS.

Insert the XP installation disk and reboot the system.

If the system comes with a prompt on screen, "Press any key to boot from CDROM" means you already have some partitions with windows installed.

Press any key to boot with CDROM.

If you do not have any partitions with windows installed then the Windows XP setup program will run automatically from CDROM.

From here on follow the below tutorial for clear and precise instruction to fresh install windows XP on your system.

Step By Step Guide To Clean Installation of XP

Good Luck...
 

My Computer

Computer Manufacturer/Model Number
Toshiba Satellite P775-S7232
OS
MS Windows 7 Ultimate 64-bit SP1
CPU
i5-2410M 2.3GHz (2.9GHz Turbo-Boost) Sandy Bridge 32nm
Motherboard
Toshiba PHRAA ver. PSBY1U-00F003
Memory
4GB+4GB Samsung DDR3 PC3-10700 (1333 MHz)
Graphics Card(s)
Video Intel(R) HD Graphics Family, 1696MB available memory
Sound Card
Realtek High Definition Audio version=6.0.1.6323
Monitor(s) Displays
17.3 " Trubrite TFT LCD, LED Backlit
Screen Resolution
1600x900 32 bit, Native support for 720P content
Hard Drives
TOSHIBA MK6476GSXN
580.614 [GB] partitioned C: 80GB and D: 500GB with hidden recovery partitons.

Spare bay for 2nd HDD but no SATA connector :-(
PSU
Toshiba AC/DC Adapter
Case
Notebook
Cooling
Built-in Fan
Keyboard
Premium Raised Tile keyboard
Mouse
Logitech M215 wireless mouse
Internet Speed
Not fast enough
Other Info
Built-in Harman Kardon speakers with Dolby Advanced Audio, Waves MaxxAudio® 3. HDMI, 1xUSB3+3xUSB2 ports, WebCam, Battery life 4hrs 11mins, 4GB Readyboost SDHC card, WD My Book Essential Ext HDDs 2 TB, 2x1TB, My Passport SE 1TB and WDTV 1st Gen for Multimedia playing on a Sony Wega 32" LCD.
Recent addition to my toys are Asus Transformer Pad TF300T with 32GB onboard sd card + 32GB microsd card.
My computer OS has been resolved. Thank you.
 

My Computer

OS
Windows Xp
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