You can empty the vault but that may not solve the problem since the file keeps returning.
lock.exe is effectively cleaned with ewido but there may be other files in the same folder as well. Below is an example from an ewido log report.
C:\Program Files\Internet Explorer\loader.exe -> Downloader.Agent.akj : Cleaned with backup
C:\Program Files\Internet Explorer\lock.exe -> Downloader.Delf.ang : Cleaned with backup
C:\Program Files\Internet Explorer\update.exe -> Adware.BHO : Cleaned with backup
Since you can't use Ewido on ME, try the following online scans. According to a Panda log I found, it should disinfect lock.exe.Trend Micro Housecall ScanPanda ActiveScan
Are you having any other problems with your computer? I am finding this file in various logs with smitfraud infections.
If the online scans don't work, then download and scan with Sysclean Package.
1. Create a new folder on drive "C:\" ("C:\New Folder") and rename it Sysclean
2. Place the sysclean.com inside that folder.
3. Then download the latest Virus Pattern Files (lptXXX.zip).
4. Extract the lptXXX.zip
pattern file into the same folder you created for sysclean.com.
5. Close all open applications and DISABLE
your current anti-virus software. Some anti-virus programs such as Avast will alert you to a virus attack when running sysclean so it's best to disable them first.
6. Reboot into "SAFE MODE
7. Open the Sysclean folder and double-click on sysclean.com
8. It will take some time to complete. Be patient and let it clean whatever it finds.
9. Exit when done and re-enable your anti-virus program.Note: This tool generates a log file (sysclean.log) in the same folder where the scan is completed. When using Sysclean its best to use the Administrator's account or an account with Administrative rights otherwise you will not have the rights to scan some locations resulting in Access is denied log entries.