Let's look in another direction. How about your monitor? Is it calibrated properly? There are instructions with most monitors that show you how to do that.

Is your scanner calibrated? If you have a "sheila" negative or print (That's a perfectly color corrected negative/print) you could scan ithat "perfect color" image and see if the "perfect color" shows up on your (calibrated) monitor. If it doesn't, then you should be able to adjust your scanner so that your calibrated negative/print matches the view on your screen.

All the other posters above have valid points. But, you also have the complication of scanning and monitor performance to complicate this color business.

That's why I stick with black and white