If as Scott suggests dbgeng.dll is a missing Microsoft file used in programming,then why not visit:
http://www.dll-files.com/ and download the dll for free.Also try
http://www.windll.com/
However,is the name you have given correct,as a quick search by me on both sites,said that their was no such file?
If I've missed it,apologies. :D
All the best,
Nez.