Q:

Can't delete filename with invalid character windows 10

Filename has invalid character 
I have tried the del command in cmd to delete it but I got "The filename, directory name, or volume label syntax is incorrect."
Please help!!!

A:

Use the Windows explorer: the command prompt has limited ability for displaying and handling strange characters, hence the usage of the Windows explorer is advised for such matters.
As mentioned in the ServerFault URL, you might do the following:
chkdsk /F
Reboot the PC
Use the Windows explorer again for deleting the file

