You can delete it but if it was created by the computer shop I wouldn't, I would just change it's status to a limited account so that it cannot make changes to your system unless you change it back to admin status. If strange things are popping up I would run several different scans to see if your current AV missed something (they ALL do). Here are some free down loads and on-line scanners I use: malwarebytes Free Down load Bit Defender On Line Scanner Live One Care Scanner Again all are free and I run multi back to back scans on machines I know are infected or that I suspect to be. No AV catches everything, so a clean scan from one doesn't mean you are safe.