Error when modifying VI library in Labview 5.1

[Labview User]

I am trying to add new VIs into a VI library file using the file manager. I get the following error:

Error 8 occured at can't open VI library resource file
Possible reasons
LABVIEW: file permission error
or
NI-488: DMA hardware error detected

If I try to edit the VI library file, I get the following error:

File permission error occured editing VI

I haven't developed the VI library file. It has been developed by other people and now I have to reuse it adding more VIs. I log in Labview with the same user as the previous developers but I still get the same error.

My NI-488 drivers are correctly installed.

On the other hand, the PC (windows 95, Labview 5.1) where the original VI library was developed works
when I try to add the new VIs. I work with another PC (windows XP, Labview 5.1) where I get the described errors.

Some help would be very useful because I have no idea and I don't know what else to try.

Thanks!

[Jonnie_5]

1. Make sure the library property is not set to Read Only (right click llb->Properties-> General)
2. It may be an XP permission error -> make sure you're logged in as the admin.

See also: http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/d95e17dfa38ca8a386256b21007660d0?OpenDocument

-AND-

http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/e421b72d47c19dee86256c9b007a6472?OpenDocument