Having several problems with a vista laptop.

Hello,
I have a dell insprion M1530 with windows vista. Two days ago everything was running smoothly i awake the next day to see my laptop wont get on the internet. I know though the router is working fine because i have a xbox and can go on xbox live. So i try a system restore but that did nothing at all. I looked up some things but nothing helped me. I have tried using the CMD to help but that failed. I read somewhere to uninstall Mcafee so i did that but to no avial. So i tried to system restore it again but to a further point. This time it wont even let me system restore. I tried o update windows and windows defender but it wouldnt let me do that either. There is no apprent virus that i can see like no ads or anything. The only thing that look odd is that even though i uninstalled Mcafee the symbol for it appears on my tool bar and adds another symbol every minute or so when i scroll over the symbols they disappear.Also i have run Malwarebyte Anti-Malware to check for viruses but to no help. I am really confused and dont know what to do i am begging for some serious help. thank you