Random Popup Window from App Store. Help?
So recently my mac has been glitching whenever i log in by putting a pop up with gibberish on my screen and when i click the blue it takes me to apples, forgot my apple id page. I have no idea what its doing or why its here since i have never seen it but a buddy of mine said it could be malware or adware. i just need help on knowing how to get rid of it and what it is. thank you!
MacBook Pro with Retina display, OS X Yosemite (10.10.4)