Stick a post-it note on it saying "Arachnids not welcome".
Vacuum your house better and get all the cobwebs gone wherever they are, so less spiders inside.
Leave some dead flies a small distance from your PC. It will lure them away.
Put the case on legs, and spray the legs with spider spray. Make a shelf to go above the PC, slightly larger than the PC, and spray that with spider spray, so they can't drop onto it.
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