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Hi, It seems to be BIOS password, if you don't remember or don't have the BIOS password you have to reset the password by opening your CPU cover and removing the CMOS coin battery, this will reset the BIOS password but dont forget to return back the battery and start using your PC.
Those two screws should have (on a Tower Model) made it so the lock will be unable to hold the case in place. If you know the BIOS Password you may be able to disable the lock from within the BIOS. I do not have one of these computers to perform trial and error on at this time, but If I see one I'll check back and reply to my solution. Best of luck!
On most PCs you can open the BIOS by hitting while the computer is booting: Del, F10, F2, Alt+Enter, F1. These are the most common but if they don't work just hit keep hitting your different "F" keys each time you boot one of them should open the BIOS. If the BIOS is password protected you'll need to either remove the BIOS/CMOS battery or short out the reset jumper on the motherboard.
If you remove the system battery on your motherboard, leave it off for about 10 minutes and replace. it should reset your bios and remove any passwords. Or if you have your windows installation cd, put it in, restart the computer , go through the setup and choose "repair my windows" setting.
Every case is different, and I particularly do not know yours. In most cases, besides a couple of holes for a physical lock on the case, there's a BIOS option that allows you to LOCK the case electronically. Find the key that gives you access to the BIOS upon boot (usually F2, F10, etc) and press it. The option you're looking for should be under a menu item that sounds like System Security. Find the one that reads something like "Intrusion Detection", and disable it. Make sure you save the change prior to rebooting.
ok, this time try to reset the bios using the jumper (small bit of coloured plastic near the battery) move the position of the jumper and hit the on/off button, the computer should not start if you have done this right, move the jumper back to its position and start the pc, go straight back into the bios and set the date and time, hit F10 and ok or yes and you should have full control of the bios. if there is no jumper, remove the battery again for 10 mins and make sure the power cord is removed from the back, hit the on/off button a few times to drain any residual power, after 10 mins replace the battery and do what i told you to with the bios