If you do a
and type CMD then press enter
Then in the command prompt window type
while the Internet is working
Look at the lines that read DNS Server and note down their IP addresses.
Leave IE closed with no downloads and no MSN etc connected.
Then type
Code:
ping -t <dns server IP>
Leave it for about 10minutes and then go back to it and press CTRL+C to stop the ping.
Then check how many dropouts or percentage loss there is. It could well be a duff DNS server that is up and down alot.
If you find issues then set your PC to auto detect its IP and DNS using DHCP and see if this cures it (if its not DHCP already).
---------- Post added at 11:55 ---------- Previous post was at 11:54 ----------
Also, if your PC is DHCP and it's a DNS issue, the rest of the PCs/Laptops on your network should have the same issue... Check this out with one of them.
If not it could be spyware or something on your PC affecting the TCP/IP stack.