you seems to be a rich person! bought new modem router etc iam from india and those thing are pretty costly here. anyways please let me know the service tag of your system also the model number and manufacturer of your router. i have worked for dell inc for 3 years! i understand your frustation at this point, might go high if you call dell tech support so be a littlebit paitent i shall try my level best to help you please let me know the service tag and router model also how many computers you have on your network and what type of network like can you transfer files over the network? is it wired or wireless network? are you using a modem-***-router or they are seperate? you have this problem in a perticular place in your home like in the kitchen or upstairs? reinstalling vista will be a waste of time dont' worry i don't think we need to do that!! if you contact your vendor the tech you speak with needs to finish the call within a specific time so will try to misguide you and the quickest resolutions from the vendor is by running the recovery "image restore" upon doing so all the information and settings are lost back to square 1 so its a nightmare at times and i shall try my level best to avoid that. and please let me know what was resetted by your isp and who are they? was the settings of the router and modem was resetted or the password???