Where is the circuit breaker for power windows on a 1998 olds 88?

There isn't a dedicated circuit breaker specifically for the power windows in a 1998 Oldsmobile 88 (or most cars for that matter). The power windows are controlled by fuses, not circuit breakers.

To find the relevant fuse(s), you need to consult your owner's manual. It will have a fuse box diagram showing which fuse(s) control the power windows. There might be one fuse for all the windows, or separate fuses for different circuits related to the power window system (like the driver's side and passenger's side).

The fuse box is typically located under the hood or inside the car, often under the dashboard. Your owner's manual will show you the location of the fuse box(es).