Mapped Drives Windows

I tried mapping drive and was sucessful in mapping using the home folder option in windows 2003 server AD user profile.But after I used a batch file for mapping 3 drives it all got messed up.I found that the old mapped drive was not disappearing.After I used the disconnect drive option I found that the old mapped drive disappeared and i tired my best using the persistent option in the batch file but I cudn’t get the mapped drives at all.I even cleared the MountPoints2 in the registry.I need to mapp 3 drives and when I run the logon batch file from the client machine I get a error system error 67.Please help