Change the Security Level in the Control Panel > Internet Options to Medium so you can download Firefox without Windows objecting.

I altered the security option to medium but whenever I tried to download Firefox the pop up screen appeared telling me that IE for security reasons stopped the download! Any other suggestions would be welcome. Atso

I'm having the same problem - I've set every security setting to low or none, enabled downloads, checked my windows and IE settings... this is driving me crazy.

Worst thing is that I don't have a choice - my university's remote learning software is only compatible with firefox. I like firefox, but installing it on a work PC, where everything is about Microsoft, is proving to be a huge time drain.