Word fails to save files after update

Today Serveral systems running Word 2007 no longer would are able to Save

documents. I receive the error " There has been a network or file permission

error. The network connection may be lost. (\\servernane\filename.docx)"

There was a knowledgebase reference to this error : Q291156. This did not

resolve the issue. Also, this just started.

I noticed there were updates applied from automatic updates for MS word 2007

for April 14, 2007 . When reverting back using system restore, Word 2007

then saves properly without any errors.

We are using Word 2007 on XP systems with a NT 4.0 Server SP6 .

I need to resolve this issue or I will not be able to apply anymore updates

to office and or windows XP.

Help