Very slow network access on 1 Windows XP computer

Running Windows XP on a small peer-to-peer network (3 computers), connected to a modem/router.

One of the computers network access intermittently slows down significantly.

This problem happens regularly but intermittently. When the problem happens, if other computers try and access it's files or vice-versa it is very slow or if it tries to print to a printer on another computer it is also very slow.

I put in another network card (different brand) and that made no difference.

I ran a continuous ping test to the router from this computer and most of the time it says <1ms or =1ms but sometimes it goes up to 10ms or more. The other computers on the network all show <1ms or =1ms. However, when the problem occurs and i ping the router it often says <1ms yet access is slow, so the higher than usual ping times don't always correspond to when the problem happens.

I ran the ping test in safe mode overnight and the highest reading was 2ms. When I ran it in normal mode overnight it was 10ms or more.

This lead me to think it was a software issue but I have looked at each process in task manager and there was nothing out of the ordinary.

It has up-to-date AVG anti-virus and I ran Spybot over it with no infections found. All service packs and updates installed.
knobbylowboyAsked:
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knobbylowboyConnect With a Mentor Author Commented:
The problem is now believed to be a faulty modem/router.
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pablovrCommented:
Some things to try:

Slow network browsing in Windows XP:
http://www.ss64.com/nt/slow_browsing.html


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dfxdeimosCommented:
Open up C:\Windows\System32\Drivers and delete the "tcpip.sys" file that you see there. After about 15 seconds Windows will rebuild it. Reboot your computer and see if the issue still remains.
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dfxdeimosCommented:
It is not a good idea to delete the desktop.ini file as mentioned in the first poster's article.
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knobbylowboyAuthor Commented:
No, this has not helped.

dfxdeimos: Open up C:\Windows\System32\Drivers and delete the "tcpip.sys" file that you see there. After about 15 seconds Windows will rebuild it. Reboot your computer and see if the issue still remains.
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cMoo92Commented:
Do you have the free version of AVG? If not, try doing a repair install on it: http://www.avg.com/faq.num-948#faq_948

AVG (Paid version) recently had an update come out for it that messed up network settings on some computers.
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knobbylowboyAuthor Commented:
It is the free AVG. I did uninstall it to test but the slow ping times remained.

cMoo92:Do you have the free version of AVG? If not, try doing a repair install on it: http://www.avg.com/faq.num-948#faq_948
AVG (Paid version) recently had an update come out for it that messed up network settings on some computers.
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knobbylowboyAuthor Commented:
More information on the problem...

The problem has been particularly bad today. I notice that a VOIP telephone attached to the network every few minutes reports that it has been disconnect then reconnected to the network. If I disconnect the problematic computer I no long get these messages.

Looks like that computer is doing strange things to the network.
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pablovrCommented:
Don´t you have a duplicated IP address? It sounds like.
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pablovrCommented:
Check the IP address assigned to the IP Phone, and check whether there is any computer or network device using the same.
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