Fujitsu Siemens Computers Fujitsu-Siemens PC - Manual (Page 66)

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3.2 The operating system
The operating system is the "organiser" of your computer; the
operating system coordinates all functions e.g. for the graphics
card, the soundcard, the modem the network card and the external
devices using drivers.
If your operating system should fail to start, or if faults should occur
on your hard drive, it may be necessary to reinstall the pre-installed
software.
Computers from our company are supplied with a pre-installed
"Microsoft® Windows® XP Home Edition" operating system as
standard.
On your PC, you can find the registration code label as proof of the
legitimate purchase of the "Windows XP" operating system. This
registration code is not necessary for any reinstallation variation of
the operating system, as it is a BIOS-locked OEM version. You
should therefore only use BIOS versions that have been certified
by Fujitsu Siemens Computers.
With the BIOS-locked OEM version, which you have purchased
with your Fujitsu Siemens computer, it is not necessary to activate
the "Windows XP" operating system. Registration is optional. For
details, see the manual "Microsoft® Windows® XP Home
Edition - Getting Started".
In case of a problem, you can restore the system to its status on an
earlier date, without losing personal data files (e.g. documents,
Internet favourites and e-mail). Windows XP system recovery
monitors changes to the computer and generates easily identifiable
recovery checkpoints on a regular basis. These recovery
checkpoints allow you to restore the system to its status at an
earlier point in time.