Take out the HDD and put it back in just in case.
http://forums.toshiba.com/t5/Computer-Troubleshooting/Status-error-0xc00000e9-PLEASE-HELP/td-p/268917 and thousands of other posts point to the same common issue on this one.
You can try a fresh install of the OS if you want but most replace the HDD.
I have an Acer aspire 5742z and a few days ago it started running very sluggish, than it got worse and "Not Responding" kept popping up. I ran several AnitVirus and Malware programs like AVG, Alast!, and SUPERantimalware. The only program to detect anything was the SUPERamw (its called something like that I honestly don't rememeber), so I fixed the issues and the computer got no better. I tried running MalwareBytes several times but before every scan finished I would get a BSOD and have to restart. I also ran a program called ComboFix and it installed, ran, and finished successfully but my PC ended up getting worse and worse now finally when I boot up it goes to the Acer screen where I have F2 options and F12 options. After that, It goes to a Windows Boot Manager screen telling me Windows has encountered a problem communicating with a device connected to your computer. It says it is caused by unplugging a removable storage device such as an external USB while the device is in use or by faulty hardware such as a hard drive or CD-ROM drive that is failing. At the bottom of the message i see this exactly:
Info: An unexpected I/O error has occurred.
F8 (Safemode) option is unresponsive. Only a 5-10 second loud beep than goes to the I/O error screen. It is a constant loop from Acer screen to Error Screen and over and over again. I have no clue what to do! Please help me! Please and thank you for help!
Note: This post was edited by a forum moderator to remove email address for member's privacy on 07/18/2013 at 9:43 AM PT