I'm not finding any info on icwhun.dll.
There are several tools we can try first but lets start with Unlocker which you can download from here:http://www.majorgeeks.com/Unlocker_d4660.htmlhttp://ccollomb.free.fr/unlocker/
Helps delete locked files with error messages like:
-Cannot delete file: Access is denied
-There has been a sharing violation.
-The source or destination file may be in use.
-The file is in use by another program or user.
-Make sure the disk is not full or write-protected and that the file is not currently in use.
1. After install, right click the folder or file and select Unlocker from the menu.
2. If the folder or file is locked, a window listing of lockers will appear.
3. Click "Unlock All" and you are done.
I also recommend you do the following:
If your running Win XP/2000, download and scan with Ewido Anti-Spyware v4.0
in "SAFE MODE
Print out the Ewido Install and Scan Instructions
Then perform these online Virus scans
:[Watch the Address bar in IE. You may receive alerts that "This site might require the following ActiveX control...Click here to install...". Click on that alert and then Click Install ActiveX component.]Trend Micro Housecall ScanPanda ActiveScan
[ActiveScan Panda does not remove adware/spyware but will autoclean for viruses & worms.]