I have a Dell XPS running Vista. it has always run vista with no problems. well today it's been acting up all day. internet cuts out then comes back in...usually it it out. Rebooting seems to help but only for a little while and then it's back to the same shenanigans.
It does this in Firefox and IE--both.
Doesn't matter what website. They all refuse to work sometimes, AIM too.
Also, recently I rebooted my computer and the monitor resolution was smaller, for no reason. It's fine this way, actually I think I like it better, but what gives?
NO I have not installed or removed anything new.
Where do I even start in fixing this? I need step by step help. Can you guys and girls here give me another miracle?

Thanks in advance. I'll do anything you suggest except take my computer apart or anything.