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From here it doesn't look good. This is a 10 year old machine. How much do you want to invest before buying a new one??
Hope this information will help.
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It sounds like it could be a problem with overheating, which is causing the machine to turn itself off. Try opening the side cover, and carefully cleaning the motherboard and especially the CPU fan - which is the large fan probably on top of a silver box with loads of fins on it. Carefully remove the dust, and see if this clears up the problem. It may be worth removing and refitting the memory whilst the computer is open, to reduce the problems of bad connections between the cards.
If it doesn't fix it, then reply here with any error messages that pop up on the screen.
The screws on some computer cases are believe it or not behind it's front plastic cover. In addition should it be a Dell it could have buttons on the sides, top & bottom, or a lever AND screw on the rear of it's left side. Carefully inspect your case. If there are no visible screws, buttons, or a lever on it's back then your case most likely has it's screws behind the front cover (I will continue to research this and re-post once I find your model's exact instructions.). If this is the case, feel the bottom of the front cover for a recessed area in which you should find a latch of some kind. If no latch, carefully (so as not to break) pull at the corners of your case's front cover. Most "pop" off easily though some may be a bit stubborn. Once your front cover is removed you should be able to identify how to remove either the left panel, or the computer itself may just slide forward out of the case. Hope it helps.
Make sure you have uninstalled any other antivirus software from the computer. Some PC''s come with Norton or McAfee pre-installed. You can go to the Control Panel, and to "Add or Remove Programs" to see if there is any other protection software you may have missed.