Contact Customer Service for assistance. This virus consists of a macro module in the spreadsheet. Leaving the file also provides some protection against reinfection by the same variant of Laroux. You can safely delete if you choose. Chkdsk isn't reliable for detecting a memory-resident virus because drivers can be loaded in lower memory.
Some viruses write a temporary file to the local machine to contain the virus source code.
The virus uses VBA to copy the code from the temp file to the new document host. This file will be sometimes be detected and is safe to delete. When these files are internally the JPG or GIF files for example, these are specific types of data files, and have no executable code or macros in them. They cannot be infected with viruses. However, worms and trojans will sometimes make it appear as though their files are harmless data files by adding an extension such as JPG before its true extension.