Avast popped up an alert for "PortIo.sys" located in the system32/drivers folder today. It came up with 2 different alerts... one for a folder in Avast, and the other for the explorer.exe file for Windows. Avast moved the file to the Chest and it's coming up clean but it won't let me restore the file.
I can't find any information about the file online though, and it isn't infected. I never had any problems before. The only thing I can think of is that I had just updated a few Windows updates for XP. The error didn't come up until after I had restarted the computer.
Does anybody know what that file is and why Avast won't let me restore it since it's clean? I have not had any problems on my computer. Everything has been running normally.
Edited to add I included a screenshot of 1 of the alerts that came up. The other one had an Avast folder under the Process instead.