Is My PC Hacked?

When I go to restart my PC, I get a blue window (not bsod) indicating that 2 apps are restarting.  It gives two buttons below that are "Restart anyway" and "Cancel"

Above that, it lists two apps.  The one looks like an "Explorer" session with the folder-spec
D:\audio\Documentation

The one that concerns me leads me to believe it is a virus.  The name of the app is "t".  I try to go in and search for the process "t", but cannot find it in Task Viewer.  I could not find a "T.exe" on my hard disk.  The only thing that comes close is the app "Telegram.exe" .  But nonetheless, the screen displays "t" with no file extension listed as one of the two apps still open when trying to close.

I have tried using "Process Explorer" to look for this anomaly, but cannot find anything.  I am really worried that my system is infected somehow.  I am using BitDefender as my A/V and feel pretty comfortable with it.  I have also searched my system with MalwareBytes and both scans have come up clean.

I welcome any help that can be offered.  Of course, I could just re-install and I am OK with that.  I would just like to know what this app "t" is.

TY,

Vince Caruso