Forefront TMG 2010 logging permission issue

Hi

i recently moved the logging folders (firewall/web proxy/ queue) from C drive to D drive on my 2008 R2 server

according to tmgBpa recommendation

i gave the folder the same permissions as the original has, logs appearing to be written normally but i keep getting

The Discretionary Access Control List (DACL) in the security descriptor of the logging folder D:\TMG_Logs\FireWall_Logs does not grant full access to both the Network Service and System accounts.

for all logs related (as written above)

googled it for a while but cant seem to understand how to move forward

any help would be appreciated

thanks