noise problem plz help

Hello

I just noticed that the pictures i shot in the last week have an unusual amount of noise.
They where all shot at an iso of 100 in RAW format.So i compared them to similar ones i had shot before under about the same lighting about a month ago and they dont have that problem...

Anyone know what the problem could be?
I hope its not the camera.

I use the canon SLR,EOS digital rebel i had it for 2 years and a half now and i sent it for repair last spring after i dropped it (DOH!),it worked just fine after.
Theses pics where taken with the 18-55mm lense that came with the camera.

thanks

post up some pics so we can see the problem.

To get people's opinions they will ask to see a sample, then we may have an idea of what it could be

Pictures and Exif information, please.

The most likely cause is that you underexposed the shot to begin with. In your RAW converter, you brought it back up to look ok,but there will be noise. This is the #1 reason for noise - underexposure.

Read this:

http://www.luminous-landscape.com/tutorial​s/expose-right.shtml

J.