I had roaches in my PC, can't be helped. This PC doesn't live in the house though, it lives in the tool shed, right the smack below the work bench. Below it stores plumbing parts, above it wood, PVC. One end of the work shed holds the lawn tools. Leaning against the shed on the outside are about two flat beds worth of top soil, humus, and mulch in 2 cubic feet bags. All this makes the West side of the shed looking like a bunker with sandbags. Not all PC's live in houses, and some of them run 24/7 without air conditioning and is sometimes the warmest place in the entire building
Its a wood workshop, we have roaches. Not house roaches thankfully, these are cuter and alot of variety. Occasionally we have mice.... and then came snakes. To change a power supply in the PC I have to negotiate with our resident spider first, drag the PC out, blow out all the dust in it, in some places about 4" of saw dust as the case sits under the miter chopper.
Win98SE, never had a problem with anything, dust proof... If I sent the computer in for repair. They'll probably wonder how the heck do I live in my house. Unfortunately its no longer with me, Hard drive died, I stupped it full of sawdust and lit it on fire. Afterwards air blasted it clean, gutted it and brought the chassis in as a joke to my PC repair class. If memory serves me its still sitting in the instructor's cabinet when I graduated