Hi Mike and all friends,
Sorry for changing this thread topic since I wanted to concentrate more on
the file checksum function in this message rather than file deletion.
A file calculation utility is a program used to verify that a file is still
intact. In other words, a checksum is a file signature. It does so using
certain cryptic digits which should match the original file. To use this,
you must have the checksum for the original which must be supplied by the
person distributing the file. Most people ofering downloads on the internet
provide a hash or MD5 number for their file. Copy this number to use it
later when you wish to verify the file integrity on your own machine. If the
file is whole or not corrupted, the numbers should match, otherwise if there
is a difference, it means your copy is not the same as the one offered by
the person who distributed the file.
The common format for checksum is MD5, but you can also have hashes. If both
are supplied, copy them and use them with your file checksum calculator.
Calculating checksums is also used in cases where you wish to burn data to
CDs or DVDs or transferring files to another media. it takes into account
that during such transfer, whether it be through download, burning process
or file management, there are some discrepancies that might happen due to a
number of factors. Some of these are noise by the distributing channel,
incomplete transfer, download problems, a malware attaching itself to a file
in transfer, or related problems beyond human control.
So to find that the two files are the same, a file checksum utility is used
to verify the distributor's signature.
However, you need to have a program like Fast sum, or Winsum to do that. I
use one called HashTab which installs itself as another tab on your file
property dialog. There are many good programs accessible to JAWS and other
screen readers like NVDA which are free. Unfortunately, I am writing this
without any links to these programs, but I trust someone may help or even
add on to my explanation.
Take care,
Ishe
----- Original Message -----
From: "Mike & Barbara" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 01, 2010 6:45 PM
Subject: Re: [Blind-Computing] Deleting a corrupt file
Hi Ishe;
What is a file calculationchecksum and how does one perform this task?
Your
help is greatly appreciated. Thanks much. Take care.
Mike
----- Original Message -----
From: "Ishe Chinyoka" <[email protected]>
To: <[email protected]>
Sent: Monday, May 31, 2010 6:10 PM
Subject: Re: [Blind-Computing] Deleting a corrupt file
Hi Mike
It happens all the time that malware detectors may raise an alarm for a
fairly innocent program. Remember the old days? We used to have JAWS
detected as a malware: even the FS guys suggested during that time to
disable all antivirus programs during installation of JAWS. The reason was
that the way JAWS works poses a threat to a system: it tries to detect
keypresses, find MSAA hooks and runs in the background of any app. While
the
screen reader behaves this way, it is to provide speech for any program,
but
antivirus programs saw this as a potential threat. This was later
resolved,
but it just shows how some patterns that are used by malware programs can
be
confused for innocent ones.
Before I give any recommendation, I may just say Unlocker is a useful
utility and I had been using it for the past six years without any problem
on my system. However, it may happen that the way it works may not be
palatable with how MS Security Essentials detects trojan worms.
Another reason is that during downloads, a file may be corrupted. So you
may
simply need to run a file calcluation checksum instead to see whether the
file is still integral.
To be on the safe side (not only for Unlocker but for any program you
download and wish to install on your PC), consider setting up a restore
point first. After that, install the program. If anything strange happens,
simply restore your computer to its state before the installation.
Otherwise, there is nothing wrong with Unlocker Assistant. You can even
try
running a scan with another antivirus program on another machine and
compare
the results.
Take care,
Ishe
----- Original Message -----
From: "Mike & Barbara" <[email protected]>
To: "Blind Computing" <[email protected]>
Sent: Tuesday, June 01, 2010 2:32 AM
Subject: [Blind-Computing] Deleting a corrupt file
Hi All;
I downloaded the Unlocker Asisstant program that was suggested for
removing
corrupted files from:
http://download.cnet.com/Unlocker/3000-2248_4-10493998.html
After downloading the program I scanned it and MSSE seen it as a Trojan
and
it was removed. Has anyone run into this? I found that by sipping the
program MSSE wouldn't detect it as a Trojan but, I am hesitant to install
the program because of the potential problems and what MSSE might see it
as
after being installed. All advice will be greatly appreciated. Thanks
much. Take care.
Mike
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