About two weeks ago I started having issues connecting to the internet. I am one of three computers accessing the wireless internet. The other two computers were having no issues connecting to the internet, that is until I disabled and then re-enabled their wireless network connection, now we're all screwed. I reset the router and then went into the web-based setup through one of the computers and changed the threshold settings, now that computer can now access the internet via the wireless connection. The thing is, it still hasn't helped my computer, I still have that whole limited or no connectivity thing, excellent signal strength, but no access. Any ideas?
Vista
Dynex Wireless G Wireless Network Card

Try disabling wireless security temporarily. Move router above furniture level. Try different channels (especially if you can detect neighbouring wifi). Move cordlessphone base, video sender etc away from router or computer.