I am unabe to open Microsoft 365 packages, its giving error message below

Hi Amina

That error usually means something in Excel's installation got corrupted, so the quickest fix is just to click "Repair now" when it pops up — that alone solves it for most people, so give it a shot first.

If it keeps crashing afterward, go to Control Panel > Programs and Features, find Microsoft 365 (or Office) in the list, click Change, and run a Quick Repair. If Excel still won't behave, go back and do an Online Repair instead — it takes longer since it redownloads the install, but it's more thorough.

Worth also checking whether it's actually Excel itself or an add-in causing this. Press Win + R, type excel /safe and hit enter — if it opens fine in safe mode, then an add-in is the problem and you can disable them one by one under File > Options > Add-ins.

And don't forget the obvious one: make sure Windows and Office are both fully updated, since a mismatch between them can trigger exactly this kind of error.

If none of that helps, it's possible your Windows profile itself is corrupted, so testing with a new user account would be the next thing to try.

Let me know what happens after the repair.

The 'Repair Now' button on that error popup dialog only performs a quick repair of the Office apps and that rarely resolves the problem with the Office apps, the best option is to perform a full online repair of your Office installation.

Before performing this process, please log into your Microsoft account on this link (https://account.microsoft.com/services/) and check to ensure your Office licence or Microsoft 365 subscription is listed correctly on your account.

Open the Settings App (gear icon on your Start Menu)

Go to Apps, then scroll down to find Microsoft Office

Select that and choose Modify - Online Repair

That should fix any issues with your Office Installation.