Laptop won't connect to wifi, other devices do

Hello,

My laptop (an HP Pavilion dv5 using Windows 7) won't connect to my home wifi. Both my iphone and my ipad does without any problems. I've tried removing the wifi network from my laptop and adding it again. When I type in my password for the wifi it tells me there's a key mismatch although I'm 100% certain the password is correct. I kept typing it in and eventually it just tells me it cannot connect to my laptop.

I tried a system restore but my laptop wasn't able to complete it. It told me the restore failed.

Any help would be greatly appreciated!