Firefox Chrome Registration Error

I thought I'd use my blog to pass on answers to annoying problems I've had, and how I managed to fix them. So here's the first "installment".

For a month or so, every time I started Firefox I received the following error:

Firefox could not install this item because of a failure in Chrome Registration. Please contact the author about this problem.

If I clicked on "OK" the message repeated several times. Then Firefox would work as normal. Nothing serious, but really annoying.

To fix the problem I simply right clicked the Firefox icon, and then selected "Run as administrator". No more errors!

It seems that there had been an error installing some add-ons, and all it required was Administrator access to fix the problem.