AG,From the sounds of it, the problem could be simple or somewhat complicated. The simple possibility is the following:
When you paste the graph into PowerPoint you are resizing the graph in one direction only (whether it be horizontal or vertical). If this is the case you are bound to see 'character overlap'. Unfortunately, this is something that cannot be avoided. It is also not specific to Origin or PowerPoint.
The somewhat more complicated possibility is this:
The default printer is not handling the information properly during the copy. To test this theory, try setting another printer as default before copy/pasting the graph. To do so, select the Start menu from the desktop and then Settings => Printers. Then, right-click on the new printer and select "Set as Default". Finally, launch Origin and test the problem.
Note: If you do not have another printer installed you will need to install one. For testing purposes we recommend installing the Apple Laserwriter driver. Furthermore, if you're not sure how to perform the installation and you have a systems administrator, please ask him/her. If you cannot obtain assistance please let me know and I'll be happy to describe the process to you.
If you find that the problem goes away while the new printer is set as default, you'll need to consider obtaining a compatible print driver for your printer. In most cases a compatible driver (whether it be older or newer) can be found on the Windows CD, but there may be situations where you'll need to go to the manufacturer's website (e.g. http://www.hp.com/). Again, if you need assistance with this, please let me know. Please be sure to let me know what printer you have, too!
I hope that this information proves helpful. If not, please let me know!
- Ryan