The Windows file user32.dll is not malware. However, in an AVG antivirus update issued on Sunday, it was wrongly identified as the banking Trojan PSW.Banker4.APSA, according to ZDNet.
Those who followed the recommendation and deleted the file discovered that they either could not boot up their machines or they continually rebooted. Unsurprisingly, that left the forums filled with people seeking advice.
Later the same day the company issued another update which corrected the error.

