Calculate MD5 checksum for your downloaded files before any bad program touch them!

I guess most people do not like the anti-virus settings of their download software since their anti-virus program is already running in the background. But hey, don’t have these settings lying idle! You can always make use of them to calculate MD5 checksum for your downloaded files.

Configurate download software step by step (I’m using FlashGet as a sample)

1. Open FlashGet, click the Opt.
   
2. Go to the Anti-Virus page
   
3. Set it up
   1) Enable it
   2) Enter the path of Md5Checker
   3) You may want to modify the file types
   

We are ready to download something

1. Now try to download something! (Use your download software, not IE)
2. After downloaded, you will see Md5Checker is popup with downloaded file and its calculated MD5 checksum:
   
3. Compare the MD5 checksum with known one (if available)
4. If the checksum has no problem, click the S.Each to save

Make things organized

• To go to the downloads folder quickly, you can select the file in Md5Checker and then click the Locate
• You can move the downloaded files with their each MD5 file to the place you categorize files
  The S.Each command above can make the moving much easier
• After moved, you may want to combine multiple MD5 files in the target folder. Just drag-and-drop them into a new Md5Checker window without auto checking, and then click the Save. A new MD5 file containing all MD5 checksums will be created
  (Why combine: You can check multiple files by one double-click)
  After combination, you can delete individual MD5 files in the Explorer. Or select all files in the Md5Checker, mark them as discarded, and then click the S.Each.