... but the preview of the conversion code that google shows me doesn't show up, the page is just blank.
ucdawg12, I'm probably just having a slow day, but I'm not sure what you mean. Do you mean that:
* When you ask the system to generate the code for you, it returns a blank page, or;
* You've placed the code on your conversion page, but you do not see the Google Site Stats 'image' that you expected to see?
If it is the second case, then no worries. You'll only see the 'image' if you have clicked on actual ad in the past 30 days, then navigated to your conversion page.
BTW, here is a link to the complete Conversion Tracking FAQ, just in case I haven't answered your question:
[adwords.google.com...]
AWA