You've got a lot of good advice already. I also don't like running, but I do it anyways. We have a Nordick Track treadmill that we got from Costco (about 5 years ago). I also recommend getting one with the widest and longest belt. The belt size and motor size are the two most important things to consider when buying a treadmill.
We also purchased a Nordic Track for my FIL about 3 years ago and just bought one for my parents this past Christmas.
I would definitely recommend going to a store that had a bunch of treadmills for you to try. Actually RUN on them and see if the length and width of the belt feel comfortable for you with your run/walk stride. Is there enough room width wise for you to move around and not risk tripping and falling? And definitely get a good lifetime warranty for the motor. I believe that Nordic Track comes with a lifetime motor warranty. Proform, the other brand we considered with all 3 treadmill purchases came with a 1-5 year motor warranty. We paid between $600 and $1200 for the models that we bought.
My FIL is an avid runner, so we got him the one with all the bells and whistles for about $1000. DH and run/jog a lot, but don't care about all the bells and whistles, so we paid about $1200 for a better motor, and for my parents we got a shorter belt and smaller motor because they would be using it only for walking and paid about $600 for it. We got a really good deal at Sears for my parents one, got a really good deal at Sams Club for my FIL's one, and found the best price for the model we have at Costco.
With that said, if you are new to exercising or don't want to fork out the money to get a really good treadmill, I would find other ways to get your cardio in. Run/walk with a friend (I do this twice a week with my best friend), join a Stroller Strides group (where you walk/exercise with your baby), etc. Then from there if you feel that you will be dedicated to running, then spend the money for a good treadmill.
Either way, I definitely recommend getting fitted for the right type of shoe. Even if you are just walking a few miles a week on a treadmill. Having the right shoe will help prevent injuries, help cushion your spine from the impact, etc. Any good running store should be able to look at your gait/stride and foot imprint and be able to tell you what type of shoe will be best for you. And they should be able to find a shoe that fits you perfectly. I like Road Runner Sports and Movin' Shoes. There is no charge for the "tests" they do to find the right shoe for you. And the price of the shoes are comparable to most other stores. Most of my shoes have been in the $80 to $90 range, which is average for a good run/walk shoe.
And most importantly, find something that is FUN for you to do :). I get bored easily, so I am always changing up my routine.