You can delete the files in the virus vault.
You may want to do some extra scans to ensure the computer isn't infected as well.
Download
HijackThis to your desktop.
Double-click on the file you just downloaded.
Click on the "Install" button to install.
It will by default install to the directory - C:\Program Files\Trend Micro\HijackThis
Please do not change the default install location.
Upon install, HijackThis should open for you.
Next click on the "Do a system scan and save a log file" button.
HijackThis will scan and then a log will open in notepad.
In the top left of the notepad window click "File" > "Save As" name it hijackthis and then save it to the Desktop.
Please save the log as a text (.txt) file.
In your post, add the log as an Attachment.
* Don't have Hijackthis fix anything yet. Most of what it finds will be harmless or even required.
** Don't use the Analyse This button. It's findings are dangerous if misinterpreted.
You may need a few different posts to get the whole log in