Problems with folder sharing. Four PC's, all win XP or XP Pro, all SP3. All are set up the same, as far as I can tell. PC's 1,2,3 can all access shared folder contents on PC 4; with any other as target, remaining three can see shared folder but not open it. Shared printers on any PC are accessible to others. All the PCs can be pinged from the remaining three. All the PCs show up to each other in Network Neighborhood. All four PCs can access the Internet. There is also a NAS box on the ntwk, all four PCs can see it, see folders on it and access folder contents. The Router mfg says "not a Router problem." Error msg when failing to access folder is: \\machinename\Transfer is not accessible. You might not have permission to use this network resource. Contact the Administrator of this server to find out if you have access permissions. Not enough server storage is available to process this command. [OK]I'm the Administrator for this home network! The network hardware consists of a cable modem, a router getting its input port address from the modem and doing DHCP address distribution to the 4 PC's. An earlier answer here suggested hard-coding machine names and addresses in the C:\Windows\System32\drivers\etc\hosts file. All my PCs have no entries in that file, which is dated in 2002. It would seem impractical to hard-code addresses there where the actual network is doing dynamic address assignment.NOTE: I move (and move the PCs) between summer and winter quarters. I have a separate set of cable modems and routers in the two locations, both set to do DHCP and using the same address ranges for DHCP, so as to not have to re-do modem settings with each move. In principle, I should be able to unplug the PCs, move them, plug them in and be good-to-go. The move last spring was fine, this fall's move isn't and I'm bamboozled as to why.1 person needs an answerI do too

Hi WaltHP, Thanks for posting. This can often be due to an antivirus or other similar program. First disable all antivirus, if that does not work try uninstalling. If you are still getting that error please try the following. Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk. Note An antivirus program is designed to help protect your computer from viruses. You must not download or open files from sources that you do not trust, visit Web sites that you do not trust, or open e-mail attachments when your antivirus program is disabled. For additional information about computer viruses, click the following article number to view the article in the Microsoft Knowledge Base: 129972 (http://support.microsoft.com/kb/129972/ ) Computer viruses: description, prevention, and recovery Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 (http://support.microsoft.com/kb/322756/ ) How to back up and restore the registry in Windows You can increase the IRPStackSize value. You must first add this value to the following key if it is not already present: HKEY_LOCAL_MACHINE SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters Value Name: IRPStackSize Data Type: DWORD Default: 0x4 Maximum: 0xC Increasing this value requires some memory from the non-allocated memory pool, but the impact should not be noticeable. NOTE : It is not always advisable to set the IRPStackSize value to its maximum of 12. Generally, you should start the value at 4 and work your way up, increasing the value by 1 each time. The problem may still occur if the value is too high. This error message may also occur after installing or uninstalling virus-scanning software. You may want to remove the virus-scanning software or increase the IRPStackSize if you need to use the software. Modifying REGISTRY settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of REGISTRY settings can be solved. Modifications of these settings are at your own risk. Shawn - Support Engineer - MCP, MCDST Microsoft Answers Support Engineer Visit our Microsoft Answers Feedback Forum and let us know what you think