My Harbor Breeze ceiling fan is going slow like it was on "low" but it's on "high" and in the opposite direction from the switch's setting. I had it since this previous winter and the heat wave has forced me to keep it on "high" constantly. Now it doesn't work right, but it did a few days ago. I don't remember the model name, but it's silvery and has movable halogen lights.

Sounds like a bad capacitor.

Ceiling fan capactors - troubleshooting and resources - Ceiling Fans N More

I don't know what capacitor it uses. I found the model #. It's 786224448. I'd rather not discuss the model name 'cause the name sucks.

The model name is much more helpful than the model number.

The capacitor should be marked with it's pertinant information.