WindowsXP network file attributes

have recently upgraded a computer on our network from Windows2000 to WindowsXP. Since this upgrade I am having problems with the file attributes on a network drive when accessing it from the WindowsXP machine, I cannot remove “read only”. The network drive is stored on a Windows95 machine. The WindowsXP machine is using the NTFS file system. When trying to access the same network drive from a non-WindowsXP machine, the contents of the drive do not have the read only attribute set. Any ideas whythis would be the case? And how to get around it?