OK, re: Email, server 127.0.0.1 is the "loopback" IP address i.e. it refers to YOUR pc. That suggests to me that the server entry configured in Outlook is wrong. Take a look at the settings and ensure they are identical to either another machine you have or the settings pipex provide on their support site.
RE: Internet, could it be that the range of the new internal wireless PCI isn't as good as your old one? I.e. it is struggling to connect where the previous one didn't. How far away from the router is your PC is perhaps the best question for me to ask on that issue - if it is right next to it then it eliminates that problem. If there is some distance, and you can do so, I'd be tempted to move the PC next to the router and establish whether that improves things.
Wirelsss has so many factors it could be any one of a number of issues (e.g. my PS3 wireless has trouble with any security enabled in connecting to my wireless router, countless laptops have none i.e. the PS3 wireless implementation (much newer than the laptops) is the problem there for me I believe.