Laughing out loud. Do people really believe that a program of the level of Blender would lack such feature? And do they throw equivocated rants instead of wondering if that is normal?
Peculiar.
Edit:
Even though you do not deserve at the moment, I shall be patient and helpful:
1. Try the program with other mouse, if that does not work, do the following steps;
2. Remove Blender from your PC;
3. Install the latest version of Python, which is 2.5 if I recall correctly;
4. Run a register cleaner just for precaution;
5. Download the
packed version of Blender instead of the installer.
I hope that helps. Honestly.