I've been having a problem with windows update not working and I have traced the problem back to Avast (i think) removing Trustedinstaller.exe. I have got a copy of this file but when I try to move/copy it back into the c:\windows\servicing folder i get a message: Destination folder access denied - You need permission to perform this action.

How can I fix this. It's driving me mad.

How can I fix this. It's driving me mad.

My Computer
System One
-
- CPU
- AMD Athlon 64 X2 4800
- Motherboard
- ASUS M2N-SLI Deluxe
- Memory
- 4GB OCZ PC-6400
- Graphics card(s)
- Sapphire HD4850 Toxic Edition
- Monitor(s) Displays
- Samsung SM2493HW
- Hard Drives
- 500GB Seagate, 160GB Seagate
- PSU
- Corsair HX520W
- Case
- Antec P182 Gunmetal Grey