Technical PDF Related Questions
How do you determine which version of Acrobat Reader is installed on your computer?
Launch Acrobat Reader, select "Help" menu option, and select "About Acrobat Reader." If you are using version 5.0.5 or higher, you do not need to upgrade. If you are using version 4 or below, please visit Adobe's website at http://www.adobe.com/products/acrobat/readstep2.html to download a free upgrade to the latest version of Acrobat Reader.
I tried to scan my document into PDF but a lot of errors appeared.
Check the instructions that came with the software on your scanner. It depends on the error and the type of scanner and scanner software you are using.