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MrDeadman
Do not sabotage your PC. You may succeed in deceiving your parents but not Allah Almighty.
Just install latest software which will slow your PC down significantly. Then reason with your parents that your PC is obsolete and should be upgraded to keep up with latest software. Maybe your parents will understand.
Another approach is to show good performance in your education. This will further soften your parents. They want you to succeed in life.
These luxuries will come to you with passage of time.
One of my P4 builds lasted a long time. It was equipped with GeForce2 Ti graphics card. When DOOM 3 came out, my PC could not run it properly even on the lowest settings. But I understood the finanical contraints of my parents. It wasn't until graduation period, that I got the opportunity to upgrade my PC with support from my parents.
And by blessing of Allah Almighty, you can check what I have now. Every single component is from my own money this time. Be patient and have faith in Allah Almighty. God will provide opportunity to you too.