Hi Ishe; Thank you very much for such a well explained easy to understand answer. This will definitely be saved. Thanks again, take care. Mike
----- Original Message ----- From: "Ishe Chinyoka" <[email protected]> To: <[email protected]> Sent: Tuesday, June 01, 2010 11:28 AM Subject: [Blind-Computing] File calculation program was Re: Deleting acorrupt file 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 >> >> >> >> For answers to frequently asked questions about this list visit: >> http://www.jaws-users.com/help/ > > > For answers to frequently asked questions about this list visit: > http://www.jaws-users.com/help/ > > > For answers to frequently asked questions about this list visit: > http://www.jaws-users.com/help/ For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/ For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/
