Help me!! Wireless problem

So here is the story:

i have always been able to use wireless with my laptop (system wireless--no external devices)). It was only until i went overseas for holiday and bought a external wireless adapter for another different wireless (as it was required). So for the whole summer holidays i have been using this difference wireless adapter.

when i come back from holiday ..i try to use wireless again with my oringal router....but because the external wireless adapter was set to my default i was unable to connect. (therefore i uninstalled it). After i uninstalled it...i connected to the router with my internal adapter.

i am able to connect to the router. but cannot use the internat (forced to use the internet cord).

Additional info:
I go to properties of my wirelss internet and i do not have a default gateway, as for when i use a cord...i do..

i try clicking repair, but it says they coudln't disconnect my wireless adapter and told me to check if it has been installed properly.



please help if u can.....really i will appreciate it..