In the first post of this thread at the Malwarebyte's forum, go to #7 where you'll find instructions to use the MBAM Cleanup Utility. Follow the directions. It's possible, the older version hasn't been completely removed.
Download the upgrade from here:
Let us know how things go..
Downloading upgrade of Malwarebytes Anti-Malware on your http://www.cnet.com/techtracker/?mid=27cd688d5735899bcc0f8d965dca0efb - keep getting "Error occurred while trying to replace the existing file. DeleteFile failed: code 5 Access is denied".
Have removed the old version by Control Panel and still keep getting same results. What's wrong?
Microsoft Windows XP Home Edition Version 2002 Service Pack 3
Lenovo - 82AB2FE
AMD Sempron(tm) Processor 3400+