If you want to shoot static content eg. landscapes in the afternoon etc., you need long exposure times and of course a tripod. If your lens has image stabilization, do not forget to turn it off while you mount your camera on the tripod.
The other thing you can do, but it will cost you money, is get a brighter lens, (eg. F2.8). This combined with Image Stabilization will give you more freedom to capture moments in low light conditions, as a brighter lens can give you a brighter result without having to increase ISO.
Finally, another cheap method is to increase ISO. Of course this brings noise into the picture. Up to ISO 400 you may not notice the difference, but if you go higher, you will. If we are talking about point and shoot photos that you are going to print them on normal photo dimensions, a certain amount of noise won't be noticeable.
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Go into the menu and scroll to "reset"...follow the on-screen instructions. Then, clean the contacts on the camera body and the lens where they meet with cotton swab lightly dampened with rubbing alcohol.
The 400D uses flash assisted focusing. In low light conditions the auto focus cannot get a focus lock so it pops the flash a few times so the lens has a chance to focus. You will notice this will go away when in the manual focus mode (the switch on the side of the lens).
The only way around this problem (as people in a photo think the photo has already been taken and looks away when the camera actually takes the picture) is to use a hotshoe mounted TTL Canon Speedlight (430ex or 580ex) which use an infra-red focussing beam.
Automatic settings are not useful in all conditions. The built in flash is not good over 20 ft. Under low light conditions, an external flash is better option, but it costs additional too. Remember that shooting under low light conditions is always a difficult task. By the way, I don't know about such common problem in Canon XTi
If you are new to photography in general and especially SLR photography
I would suggest holding off on buying any lenses besides the 18-55mm.
The reason I suggest not buying extra lenses just yet is coz you need
to get to know your camera and if you are new to SLR photography then
you need to get your fundamentals right. Sure the 400D will let you
shoot in full auto mode but you will really not learn much doing that
and certainly not be making the most of your camera in that process and
that will extend to your new lenses too.
Get used the the control, the 18-55 is a great little cheap lens with
the pop up flash it will work great for most family pics. The 55-200mm
is a new "cheap" lens, its been marketed as letting you go beyond 55mm
thats why it starts at 55mm goes to 200mm.
In low light you need a high ISO setting, probably 1600.
You also could do with a lens with a low F number to let in lots of light. You can get a fixed focal length F1.8 cheap but might find the lack of zoom a problem.
A decent zoom with a low F number is going to be expensive.
The EF-S 17-55mm F2.8 IS for instance has a list price of around £800 / $1200 !!
You can get a non-Canon one which would be more affordable and you also won't need the IS at short focal lengths (although it always helps). Have a look at Sigma and Tamron in the F2.8 to F4.0 range but check the online reviews to make sure they are of reasonable quality.