I spent 2 hours to find that my Cisco Wrt54G2 Router has flew the coup. The problem manifested itself this way:
First the internet would drop off when you opened a new browser window. It would happen every time I opened Goggle Chrome. So I removed Chrome. The problem did not go away. So I had a new modem on the shelf with DD-WRT loaded.
I loaded the configuration and plugged it up and wallah it is working. I’m going to reload new firmware on the Cisco and see if this modem is still functioning.
I know my Laptop is clean and free of Bugs since I began every cleaner available. I suggest you do this every couple of months just to make sure your Laptop or Workstation are not the cause of problems.
Keep your virus software current. I have found the free versions of some vendors virus software do a fair job but the full version works better.