|Go to "Task Manager > Start-up tab" and see if disabling any items there find the culprit. I have known the odd legit program flash up command prompt.|
If you want to do a quick malware check these three often unearth what other programs miss. Run them in the order given:
(blue "Download Now" button on right).
Download and "Save" the file somewhere. Go to the saved file then double click it to run the program. Use the "Scan" button, followed by the "Clean" button.
Junkware Removal Tool (JRT)
(blue Download button).
Download and "Save" the file somewhere. Go to the saved file then double click it to run JRT. It might appear to have stopped at times or flash the screen but sit tight until it has finished.
(use the "Free Download" button rather than the "Buy Now" button).
After the install go to "Settings > Protection". Under Scan Options move the "Scan for rootkits" slider over to On and Run the Threat Scan. Quarantine anything it finds.
If anything is found please copy/paste the associated logs on here. If you lose the ADW log you can find it as a text file in the ADWCleaner folder directly off the system drive root (usually C).
Always pop back and let us know the outcome - thanks