Server name: GenuineMC Semi-Vanilla Server ip: 198.143.147.134 Theme: Modern for a change. Minigames or gametypes: Semi-Vanilla Anything else? Send me a PM to discuss please, I'll supply email / skype then.
I would suggest you get on Windows 7 and run either Advance System Care or CCleaner that are both free and give the computer a clean up and if you haven't done anything similar in quite awhile you should get a huge increase.
They won't fix your WiFi card but generally they are plugged in to the motherboard and are easy to replace or you can buy a USB WiFi adapter to use.