If your computer is the only wireless device on the network, try turning off the router/modem, wait a couple of minutes, then turn it back on again. Sometimes, this will fix the wireless ability of the router/modem. Also if wireless, try checking the driver in Device Manager? Maybe reinstalling an updated version from the computer manufacturer, or the wireless adapter manufacturer's website will get it up and running.
If wired, have you tried a different ethernet cable, or checking Device Manager to make sure there are no driver problems with it.
And with either type of connection, malware can cause such issues also. Click on the link below and follow all of the steps, in the order given, to scan for malware:
“Expand” the post titled: "Please try this" at the link below:
Hope this helps.
No connection when I booted up this morning. Running Win7
-All other network devices OK. Not the network
-Turning off firewalls no effect
- Win7 network diagnostics no help
- Intel Network diagnostics OK
- Can ping 127.0.0.1 but not remote computer
-select ip and dns to automatic
Something is blocking connect but I can't figure out what. Any suggestions appreciated.