My unibody macbook (latest 2010 model) wont connect to my home wifi. When it does which is rare, it is very slow. I have tried everything from renewing DCHP lease and such. This has been going on for two months.

It will not connect but my other apple devices can connect and the wifi works very well. I have moved houses to my house wifi isnt the same as the old one. Also, i have to type in the password every time even if i click autosave. Sometimes it also says invalid password or connection timeout. This has been going on for two months and is getting really annoying. I've tried most of the solutions listed on other discussions, none of them work. Any other tips? Thank you. Ps i've had this macbook for 3+ years