OK well I'm sure a few people have different ways to view manga. Some people use windows picture and fax viewer, others load up the pages one by one.
I recommend however, CDisplay Comic Reader
http://www.geocities.com/davidayton/CDisplayYou can get a download from the above site I think. If nothing else you can google it.
Its really convenient, runs the pages in sequence and you can open .zip and .rar files and view the images without ever decompressing the file (unless you have .zip or .rar files inside the original archive, in which case you have to remove them first - like if you have downloaded a volume rather than a chapter)
You can choose backgrounds, and you can just move to the next page with the roll of a mouse wheel.
If you have low resolution, you can make the image fit the size of the screen or stretch it either vertically or horizontally so you can read everything that's on the page. You can choose the background of the image so its not too bad on the eyes (personally i prefer black but then, I would) and can view most types of image.
Its what i use and I've found it an extremely useful tool, so if you don't have it already, go get it.