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Originally Posted by Rod
My computer gets all weird if it dirty and dusty inside. The CPU overheats. Check your CPU fan. Overheated computers do very strange things.
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Don't forget to check the power supply fan also. Most computers have several fans in them and it's a good idea to occasionally take the cover off and blow them out gently with dry compressed air. This is especially true if the computer is located on or close to the floor where it's more likely to build up with dust. Like Rod said, heat can cause a PC to do strange things and it's not always the CPU. An overheated power supply, graphics card, or other component can cause the computer to crash and/or "freeze". Plus it's better to try simple things first like cleaning the PC and making sure all the drivers are updated before shelling out money to replace components.