Switching from trial Windows Office 2007 to Windows Office 2003

Bought new PC that had trial version of Office 2007. Did not want to pay once trial period expirred and installed Office 2003 from old PC. What is the best way to operate system using 2003? Should I de-install Office 2007? I have downloaded from Microsoft ;package which converts 2007 to 2003 but still operates funky (asking for permissions and other weirdities). I just want a clean operation.

Thanks for any help.

From my own personal experience I first fully uninstalled 2007 before loading 2003. From what I understand though 2007 is good. But I am use to 2003.

If I de-install 2007 (Office 2003 is already installed) will I lose any 2007 documents, or will they remain in the "My Documents" section?
Thanks,

I don't know so I don't even want to venture a guess. Perhaps someone else can answer this.

You will not lose your documents if Office 2007 is uninstalled
But you may lose the ability to open those documents

Word 2007 now uses a new extension: DOCX, although you can still save a document in Word 2007 with Word 2003 compatibility ie DOC extension.

It might be a good idea to that before uninstalling Office 2007
ie Open all Documents created with Office 2007, and save them with Office 2003 compatibility

I like Office 2007, but I ended up also downloading the Office 2003 toolbar (ie File Edit View...) Because it is hard to get use to the big buttons.

Edit:

You can also download the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats
If you have already uninstalled Office 2007