CIR.exe is your Clip Index Restore. You it may have got removed when you did a scan or something. You may have to d/l it again. It might be a long shot if it works though. I say this because there are many different builds of this file and there is really no why to tell what build you had. One place you can start is http://www.acer.com.cn/driver/download.asp?file=/driver/whole/notebook/AS5670/WinXP/CIR.exe
You can try and run this file or if that doesn't work try and put it in your windows/system32 folder and restart to see if you still get the error.