Best way to troubleshoot many probs is to go back and see what changed. Any new programs or apps installed? Is the windows firewall turned on? Have you changed your virus checking mechanisms? Many AV programs that protect from network intrusions etc have software shims that all your data gets filtered through. Assuming you're running XP, to check for network software shims do this:
Start a command prompt.
Type set devmgr_show_nonpresent_devices=1
Type devmgmt.msc
When the dev mgr console pops up click view at the top and click show hidden devices.
Expand your network cards and look for miniport drivers associated with the NIC you're using.
Also from a command prompt type ping www.google.com and see what the ping times are. Depending on you internet connection speed the 4 pings should average less than 100 milliseconds. If not talk to the network people.
Many companies use filters such as Websense which can slow things down some.
Many companies also use appliances to prioritize traffic and give business related stuff more bandwidth than surfing.



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