Configuring preferences and options in Outlook.com
Hi,
Welcome to Microsoft Community.
I understand that you encounter this issue on a specific machine with browsers Chrome and IE, let me give you ample assistance. Basically, these Ads is a part of Outlook.com as a free service. We currently don't have the feature to disable or hide these ad. If you are not encountering this issue on other machines, it is possible that these machines has ad blockers installed in them.
If you want, you can upgrade your account to Ad-free Outlook.com so that ads will not appear when you access your account. To learn more about this, refer to the link below:
Feel free to ask should you have more questions.
Thank you