Hi there and welcome Sandra
The US/DS blinking is normal, it means its getting and transmitting data.
But the phone call was a scam. Its compaines usually based in India that will call you pretending to be Microsoft, indicating you have errors, and they they want to fix this for you.
They then ask for access to your computer and obtain access to your PC trying to both steal data and make unauthorised charges to your credit card.
Microsoft will never call you like this.
I advise you, if they call back (and they likely will) to tell them you know they are a scam, and hang up. This should limit them calling you again.
If you would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.