It looks like your system is connected with the company server, and that's the reason they get easy access to your system. However, Why don't you try to set the BIOS password (admin) and see if they can boot into the machine at all.
The BIOS password is the basic level of hardware protection you can have. U still have to keep your Windows XP Admin password.
With this, u should also keep changing your password every time you logout of the system.
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[Desktop]
[CPU] Intel C2D 2.4Ghz || [RAM] 2GB DDR2 || [VDU] Samsung P2370MS 23”|| [HDD] 500GB Seagate 7200RPM SATA || [OS] Mac OS X (Hackintosh)
[Laptop]
Dell Studio 15 Full HD || [OS] Now with Mac OS X LION :-D
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