Anyway!
Saurabhdua,
Go to Paint.
Open each of your original pictures one by one.
In each case click on "Image" and then "attributes".
Note down how many pixels each image is. If the two images are different sizes then change one of them so that the two files match each other. Save it with 'Save as' so that you don't over write the originals.
Open a new file and make its attributes big enough to fit both of the original pictures.
Now all you need to do is use "Edit", "Paste From" and you can insert the files into your new picture.