Word corrupting causing text to bunch together

Hey there, I have a problem on a particular users PC which using Windows XP Pro SP2 and Office XP SP3 where every so often her word session becomes corrupt and text in all views except normal view is bunched together in unreadable mess this also shows on the print outs.

The machine has been replaced she is on a new profile it has happened to a few others. The temporary fix is to reboot the machine recreating the normal.dot does not fix the problem. The reboot resolves the issue for a week or so before it come back again.

Any ideas?? network related possibly?