去幫你找了這篇，看看有沒有幫助.....

Ad-Aware freezes while performing a scan.
There are a number of possible reasons behind this problem. To correct:

First, update to Build 1.06 and download the latest definition file if you have not done so. ( 說請你更新定義檔 )

Second, it is highly recommended that you run a disk defragmentation on your computer, then a thorough 鏠heck?or 廍can Disk?depending on your Windows version. Try scanning in safe mode. ( 實施硬碟重整、或是到安全模式底下掃掃看 )

Third, start Ad-Aware scan from the Windows command line. Do as follows:
Click "Start", then "Run". Next, type the text shown below (including the quotation marks and with the same spacing as shown) for your version of Ad-Aware SE: ( 在 DOS 指令模式下掃瞄 )

"C:\Program Files\Lavasoft\Ad-Aware SE Professional\Ad-Aware.exe" /full +procnuke
"C:\Program Files\Lavasoft\Ad-Aware SE Plus\Ad-Aware.exe" /full +procnuke
"C:\Program Files\Lavasoft\Ad-Aware SE Personal\Ad-Aware.exe" +procnukep
Click 幈K?
Note: The path above (between the quotes) is the default location of Ad-Aware SE. If you installed your Ad-Aware to a different directory, adjust the path accordingly. For Ad-Aware SE Personal, when the GUI launches, click 廍tart? then 焅ull System Scan? Click 幞ext? then 幈K?
When the scan is complete, select 幞ext? In the 廍canning Results?window, select the "Scan Summary" tab. Check the box next to each "target family" you wish to remove, then click 幞ext? then OK?

If you still have problems, cancel before the scan reaches the point of stalling -- for example, after 20 objects are detected. Click 鏠ancel?on your log file. Remove any objects you want and rescan. Again, stop the scan before it reaches the point of stalling and remove any additional objects. Then try a full scan without stopping it. This should work for you now.

看來磁區斷離、或是正在運作的程式、不同的定義檔..都會造成影響，就好像已經中毒的作業系統與掃毒程式，再怎樣運作都無法徹底清除病毒一樣...不過看你ㄉ問題如果是乾淨的系統就不知道為何會如此...
原文在此....http://www.lavasoftusa.com/support/faq/