Corrupted files

Hi everyone :)
My sony vaio ( Windows 7 home premium 64bit) has internet connection issues lately. Heres what happens:
My signal strength is 100% but when i open any program(Ex: Yahoo Messenger) or any internet browser it simply says that the webpage cannot be displayed or its not available. However, i am able to connect online with IE 64bit.
SO a friend of mine checked the computer and clearly confirmed that the startup settings, services and registry settings related to the same are corrupted. So since i dont know ANYTHING AT ALL about computers :3 , i was wondering if you guys could help me out by telling me how to fix these *little* problems ^~^ before i go crazy and smack someone in the head with my laptop (jk o -o) but whatever =3.
Thanks for your time ^~^

thank you =3 ill try this and see if it works ^~^

umm nope that wasnt it, i still have the same problem u.u i think that the only way to solve this is by restoring the computer to factory settings. Does anyone know how to do it :3? without a cd? ^~^

Ok to fix this problem just open the command prompt and write netsh winsock reset. After doing so :3 , restart the computer ^~^ and the problem will be fixed :3