Wireless wont connect to secured network but unsecured is fine

Hello,
My laptop says I'm connected on secured wireless networks, but I can't access the internet. On an unsecured network (like Starbucks wifi) I can connect and access the internet with no problems. I have had my wireless network at my house for years and never had a problem until two days ago. Also, if I plug an ethernet cable into my laptop and connect to my router at home it works just fine. No clue what to do from here. Any assitance is greatly appreciated.