|Can you get into BIOS ? While your notebook is restarting, you have to press a key, such as F2 or Delete or another key on the keyboard. This is dependent on M/B maker of your notebook. Sony Vaio documentation could help. Or just look at the screen when BIOS info appears. It should be indicated somewhere, either on the left bottom of the screen or on another corner.|
Before sign of that key disappears, you have to press it several times and that takes you into BIOS.
There are several pages of BIOS. How you browse through pages will be indicated on each BIOS page.
The setting you will be looking for may be termed COMPATIBILITY or IDE mode or AHCI or SATA.
In order to be able to install XP, it should be IDE or COMPATIBILITY. SATA or AHCI, which are better communication protocols, do not let you install XP because XP has no drivers for them. They are new standards and they did not exist when XP developed.
Do not forget to save changes before exiting BIOS. Otherwise it will be of no use unless you save the changes in BIOS.