Net use problem

Hi Guys/ Girls

This is the first time I am using this forum. We got stuck at work with a problem we use the net use command to map drives for our pastel users. We have used this command on 4 different computers and they all work. This is a Dell optiplex gx620 and is currently running Windows xp pro.

The command goes as follows:

net use * /delete /yes

net use p: \\fileserver\payroll /user:fileserver\administrator Password

net use p: \\fileserver\payroll

net use x: \\fileserver\pastel12

But on this computer we keep on getting  system error 1326 has occured

logon failure: unknown user name or bad password

any help would be appreciated as I said we use this command on startup and it works on the other computers

Thanks in advance