inthewildteam: I dont know why you ask him about admin rights/safe mode/restore things - admin rights are required for avast installation; there's nothing bad with deleting/renaming system drivers in windows directory;
XQueenOfPainX: after renaming of aswTdi/aswMon2 drivers you have to reboot and then try shutdown; if it helps, you can reinstall avast without network shield provider (you can live without it).