I was recieveing internet on my labtop throught the wireless g router but now its stopped and the computer can't find anything through troubleshooter I've tried wiggling and taking the the wires out then putting back in as well as restarting the computer what can i do

Disconnect power supply to all the devices { Modem,Router and Computer } and wait for 30sec and replug them.
Try this if you haven't made any change to the SSID or the security key
If you have made changes to it remove the existing wireless connection and create a new one
This should fix it