Help in the (net use) command

[akan-sensei]

hi all
I need your help so much
I'm try to logon another computer using the net use command with this syntex:
"net use * \\PC2\c$ /user:PC1\Trial"
where PC1 & PC2 are in the same workgroup which i created. PC2 is the computer I'm trying to logon, PC1 is my computer and Trial is an account I created on PC2 and I've put that account (Trial) in the administrator group (of course on PC2)
Then it prompts me and ask me the password and i write it
After that it prompts me:
"System error 5 has occurred.

Access is denied."

and I don't know and don't even have an idea what is the reason of error message .
Please help me becouse I don't know what to do.