I'm not sure what you mean by REI on a PC, and I don't want to guess wrong. A few possibilities:
- REI, the outdoor retailer: it has no PC program. Its website and shopping app are the places to look, and the app runs on a phone, not a PC.
- A program or file named REI: check the Start menu search on Windows, or the Applications folder on a Mac. If it came from an email or download, the file name and where you got it will tell you more.
- A setting or code term: REI can stand for reverse engineering, or appear in a driver or BIOS menu. If you saw it on screen, tell me the exact words near it.
If you tell me which program or screen you're seeing, what you were trying to do, and your Windows or Mac version, I can point you to the right place.
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