A read only problem

We are having a problem here, only on a few computers, thatwhen we open an assembly, part, or drawing file, we get a "readonly" error message.
Our, alleged, IT dept. says there is nothing wrong with the serverset up, and that it must be a solidworks issue.
If it is a solidworks problem, nobody here knows what to do toremedy the problem.
Like I say, this is only an issue with a few of the machines.
Has anyone else had this problem, and what was the cure?
Thank you so much for your help.
SolidworksAssemblies