certain sub folders invisible on network from widows xp pc even though the whole drive on windows 7 is shared.Although I can access all folders and sub folders from the windows 7 pc.

Hi, This issue may be caused by Mrxsmb.sys file. Try to install the following hotfix to see what the result is: Download details: Update for Windows XP (KB896427) Hope it helps. Alex ZhaoPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.