With a home assembled computer running Vista Ultimate, and as one who has struggled with a dial up connection a number of years, I am totally thrilled with my new DSL connection. I have some questions for those 'in the know'.

Would I benefit from a brand new operating system such as Win7 or 8?

I have several home telephones, the sort that operate off one UNIT powered by house current and the two others merely plug into AC outlets. I am having difficulty getting the modem noise off these. (My provider gave me some filters that I put in the phone lines that seem to help a little) How can I improve this situation?

I hear modem noise (sometimes) on an AM radio in the same room with the computer. ?

I had Win mail with the dial up. My provider has given me a Yahoo mail program. This seems to work OK but if I could keep Windows Mail I would probably do so, (Thataway I wouldn't need learn the new program, (I'm old) but could keep my contact list. I've had some difficulty transposing my contact list into the new program. Can I have both concurrently?

Forgive the somewhat rambling questions but know that I appreciate all the help you have given me in past years and how very much I appreciate all that past help.
Keep up the good work and Thanks in ADVANCE for any suggestions.

Copas  Lots of questions.here are answers to two questions.
There is no significant difference when using different operating systems with DSL.

The DSL uses frequencies above human hearing, starting about 19,000 cycles. However, the spectrum extends well up into higher regions and AM radio may pick up some of the artifacts of the modem.

Filters have to be installed on every phone in your house. If you continue having a problem with your telephones, you may wish to consider upgrading some of your telephones. But nothing fancy as needed, just a plain telephone should work fine as long as it has a filter on it.

My personal experience with DSL reach me to believe that most of the time it's the telephone companies fault. A good DSL service requires the telephone LINE to be in pristine condition with no access drop wires and bad connections. Sometimes aligned MANNER just too lazy to check and see if there are unused drop wires on your line.

Local phone company has tried to convince me. There's something wrong with my indoor wiring and the water be do it for me for a one-time fee of $55. Each time I have declined because I know how to use a voltmeter two and my indoor wiring does not have bad connections.
After calling the phone company for many, many, many, many times  he finally got fixed. The problem was somewhere in one of their lines.
Hope you don't have as many problems as I did. But if you do, call them up on a regular basis and be very polite and explained to him what the problem is. Once in a while you'll get one other operators that will really help you with your problem and do everything they can to fix the problem. It just takes patience.

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Filters have to be installed on every phone in your house.