fractus2,
I made a mistake. That's ISP and not USP. I'm sorry for the mistake.
If you have an ISP, chances are that you can retrieve your mail (like when you are travelling, on vacation, at a friend's house, at work, etc.) by logging onto the ISP's account page. You are basically looking at your mail at the server and are not downloading it into Express Mail, Eudora, Outlook, Netscape Mail, etc.
Since the ISP webmail resides within a protected process, it can not access your email client; since it is not connected to your computer, it cannot access your hardrive or the C:\Windows area.
One of the good things about MailWasher is that you can automatically bounce mail that is not addressed to you, along with blacklisting whole domains. I did have one problem though, there was an embedded email that could not be deleted until it was downloaded. Luckily I shutdown all my email account priviledges, so it had nowhere to go (to access any other part of the rest of the system. I've set it up that it cannot delete a file once the account has created it. I have to use an admin account to do such deletes. Obviously I run anti-virus scans from the admin account, along with email scans in the email account).