Errors from a0001729.dll file are associated with Asynchronous Thread Queue (AST). An AST error could mean several things. You may have a file in your registry trying to locate another file that either takes too long to find or is no longer there.
Deleted files are often forewarnings of even bigger problems. In many cases, spyware will disable or delete registry files. This enables the malware to go undetected and wreak havoc on your whole operating system.
The best thing to do in this case is run an anti-spyware and registry cleaner program at the same time. Cleaning up your registry will alert you to any security threats and keep your computer running like new.
To try a free registry scan, click here. Award winning ZookaWare (creator of SpyZooka) launched ZookaWare PC Cleaner with a 60-day satisfaction or your money back that is worth looking into.