When I connect my PC via ethernet cable to my ADSL router it works fine. When I connect via Wireless it connects and the internet will work for a random amount of time and then stop working. It stays connected with a strong signal but no packets are received. My laptop/iphone are right next to it and wireless works fine.

If I open the Wireless USB status, it says it is connected to my SSID with full strength (54 mps - I am 3 meteres away from my router) and the activty shows as Packets 594 SENT and 105 RECEIVED (this goes up VERY slowly)

I have tried the following:

1. Turned off anitvirus and firewall completely.
2. Tested the wifi signal- I am writing this on my laptop which is next to my PC and also has full wifi strength.
3. Tried a different wireless adapter - I dug out an old PCI wireless card - it does the exact same thing.
4. Compared all wireless settings to my laptop.
5. I can ping google.com and it replies (sometimes with packet loss)
6. When I reboot the PC it will connect for a minute or two (random time) and then just stops again.
7. I tried Firefox, IE etc. no joy
8. I have updated all latest versions (Netgear WG111v2) and drivers
9. Checked Event Log - nothing unusual
10. Ping the router (and even connect as admin for the few minutes when the internet does work)
11. Changed the MTU down to 1200 using DrTCP
12. Checked Device Manager for conflicts - none.
13. I ping the router from the PC (192.168.0.10 -> 192.168.0.1) and it replies with 4 packets. BUT, on my router admin page (which I access via http on my laptop wirelessly) - if I ping 192.168.0.10 all packets timeout (pinging my laptop 192.168.0.12 works fine)
14. My router admin page shows the leased IP address for 192.168.0.10 (ie it is definitely talking to the router initially)

Now I am out of ideas - please help. I think it is an OS/Software issue as I have tried 2 different wireless adapaters (PCI and USB) with the same result but all other wireless devices work fine around mine). It's not the firewall.

It is getting assigned an IP address correctly (my PC gets 192.168.0.10, my laptop is .12) It is assigned by DHCP.

As soon as I plug in the ethernet cable it all works fine. Repairing the adapter sometimes helps but it will always stop working after a random time. The wireless adapter always shows as connected with Excellent signal but the internet does not work.

I am running Windows XP SP3 and have tried a Netgear WG111v2 USB adapter.

Thanks in advance!

UPDATE: The internet seems to be working, it is just either sending packets too small or slow to work (some small pages load bits of them very slowly but then hang).

XP seems to have a networking diagnostic app - here is the output:

Last diagnostic run time: 08/30/10 08:16:38 IP Configuration Diagnostic
Invalid IP address
info    Valid IP address detected: 192.168.0.10
IP Layer Diagnostic
Corrupted IP routing table
info    The default route is valid
info    The loopback route is valid
info    The local host route is valid
info    The local subnet route is valid
Invalid ARP cache entries
action  The ARP cache has been flushed
Gateway Diagnostic
Gateway
info    The following proxy configuration is being used by IE: Automatically Detect Settings:Disabled Automatic Configuration Script: Proxy Server: Proxy Bypass list:
info    This computer has the following default gateway entry(ies): 192.168.0.1
info    This computer has the following IP address(es): 192.168.0.10
info    The default gateway is in the same subnet as this computer
info    The default gateway entry is a valid unicast address
info    The default gateway address was resolved via ARP in 1 try(ies)
info    The default gateway was reached via ICMP Ping in 1 try(ies)
info    TCP port 80 on host 65.55.12.249 was successfully reached
info    The Internet host www.microsoft.com was successfully reached
info    The default gateway is OK
DNS Client Diagnostic
DNS - Not a home user scenario
info    Using Web Proxy: no
info    Resolving name ok for (www.microsoft.com): yes
No DNS servers
DNS failure
HTTP, HTTPS, FTP Diagnostic
HTTP, HTTPS, FTP connectivity
info    FTP (Passive): Successfully connected to ftp.microsoft.com.
info    HTTP: Successfully connected to www.microsoft.com.
warn    HTTPS: Error 12002 connecting to www.microsoft.com: The operation timed out
warn    HTTPS: Error 12002 connecting to www.passport.net: The operation timed out
error   Could not make an HTTPS connection.
info    Redirecting user to support call
WinSock Diagnostic
WinSock status
info    All base service provider entries are present in the Winsock catalog.
info    The Winsock Service provider chains are valid.
info    Provider entry MSAFD Tcpip [TCP/IP] passed the loopback communication test.
info    Provider entry MSAFD Tcpip [UDP/IP] passed the loopback communication test.
info    Provider entry RSVP UDP Service Provider passed the loopback communication test.
info    Provider entry RSVP TCP Service Provider passed the loopback communication test.
info    Connectivity is valid for all Winsock service providers.
Wireless Diagnostic
Wireless - Service disabled
Wireless - User SSID
action  User input required: Specify network name or SSID
Wireless - First time setup
info    The Wireless Network name (SSID) to which the user would like to connect = RodSof Wifi.
Wireless - Radio off
info    Valid IP address detected: 192.168.0.10
Wireless - Out of range
Wireless - Hardware issue
Wireless - Novice user
Wireless - Ad-hoc network
Wireless - Less preferred
Wireless - 802.1x enabled
Wireless - Configuration mismatch
Wireless - Low SNR
Network Adapter Diagnostic
Network location detection
info    Using home Internet connection
Network adapter identification
info    Network connection: Name=Local Area Connection 2, Device=Realtek RTL8168C(P)/8111C(P) PCI-E Gigabit Ethernet NIC, MediaType=LAN, SubMediaType=LAN
info    Network connection: Name=Wireless USB, Device=NETGEAR WG111v2 54Mbps Wireless USB 2.0 Adapter, MediaType=LAN, SubMediaType=WIRELESS
info    Both Ethernet and Wireless connections available, prompting user for selection
action  User input required: Select network connection
info    Wireless connection selected
Network adapter status
info    Network connection status: Connected
HTTP, HTTPS, FTP Diagnostic
HTTP, HTTPS, FTP connectivity
info    FTP (Active): Successfully connected to ftp.microsoft.com.
warn    HTTP: Error 12007 connecting to www.microsoft.com: The server name or address could not be resolved
warn    HTTP: Error 12002 connecting to www.hotmail.com: The operation timed out
warn    HTTPS: Error 12002 connecting to www.passport.net: The operation timed out
warn    HTTPS: Error 12002 connecting to www.microsoft.com: The operation timed out
error   Could not make an HTTP connection.
error   Could not make an HTTPS connection.