AutoCAD Customization file load failed.File not found

Experts,
I have been using Windows XP SP2 with AutoCAD 2010 version 18.0.I have been using the software for years now and I use it for 3D designs.The software has been posing quite a few problems recently and today I encounter the below mentioned error which I have not been able to get rid of.

AutoCAD Message
Customization file load failed.File not found: C:Documents and SettingspmaApplication DataAdobeAcrobat9.0ACAD-7001-409PDFIC.cui
Thanks in Advance!
