A Hardware Error Has Occurred

i have a number of users in DLO that are showing the following alert in the console. A hardware error has occurred accessing "\\DLOserver\CDP01\domain-username\.dlo\usercomputer\c_\users\username\appdata\local\microsoft\outlook\[0000000000000000000000]archive.pst\Endogastric%2fGeneral Lit: 310671-200\000000009DA9A363B5C2C74DA67B6316BB79BFF4049E2500" on the file server.  7fffffff

We are running DLO on Win7, 64 bit, computers and the server is Win2008R2.

i saw answers to previous posts about this that said the Maintenance Service needs to be run as Local System. Ours is. i know i fixed this once before but i forgot what i did. i'll be sure and write it down this time.

Thanks,

Linda lee