You ABSOLUTELY have an infected computer.
Do steps 2, 7, 8, and 9
here. When doing step 9, the ESET Online Scanner please allow it to FIX or REMOVE whatever is found.
Be sure to REBOOT after using MBA-M and also the ESET Online Scanner.
Be sure to save both the log from MBA-M and ESET. Once you have completed those steps then run a new HJT scan and post back here with all three logs.
Judy