Is there Windows based mining software that allows you to set precentage of GPU/CPU or set low priority Essentially the title is my question.

I have 3 Windows boxes that already run 24/7 for specific low CPU usage tasks.
Was hoping I could find mining software I could run on them that will not affect their functionality.

If not I might be able to "schedule" mining for off peak times?

Sorry if these are dumb questions but very new to all this.
Bitcoin CPU and GPU mining is not general considered to be worthwhile anymore because of high difficulty.

If you wish to proceed, you could try limiting the mining application to a single core in task manager for CPU mining.  Additionally Some miners have "aggression" or equivalent settings that may be able to limit the resources the process takes.