Or -- In windows exporer, right-click the picture, select edit. This will open Paint.exe. On the Image menu, click Stretch/Skew. Enter a horizontal and veritical stretch % (I use 25-40). Then save-as new file name.
If nothing else feel free to email them to me and I'll resize. You need them posting size? On some cameras you can change the setting so that they are smaller photos too.