[RESOLVED] System.DivideByZeroException ERROR (just on some computers)

[Netmaster]

Hi,

I made a downloader program which allows you to download files from the internet.
I made the program using VB 2008 and a pc running windows 7 professional 32-bit. I also tested the program on a pc running windows vista home 32-bit, on another one running windows 7 pro 64bit, and on another one running Windows XP 32 bit. It works fine on all of them.

But today I tried it for the first time on other three different PCs running:
-Windows 7 starter (32-bit)
-Windows 7 Home (64-bit)
-Windows XP (32-bit)

On all three of them it gave me an error right after I click the download button:
"System.DivideByZeroException"

this is the exact error (sorry it is in italian):

************** Testo dell'eccezione **************
System.DivideByZeroException: Tentativo di divisione per zero.
   in WindowsApplication1.Form1.Download_DownloadProgressChanged(Object sender, DownloadProgressChangedEventArgs e) in C:\Documents and Settings\Administrator\Desktop\downloader\Form1.vb:riga 221
   in System.Net.WebClient.OnDownloadProgressChanged(DownloadProgressChangedEventArgs e)
   in System.Net.WebClient.ReportDownloadProgressChanged(Object arg)

If I click on "quit" the program closes, if I click on "continue" it just keeps working nice as it should do! (so i do not see the point of this error actually)
(All the PCs have the latest framework 4.0 installed and anything else needed to make the program run correctly)

Now, I figured out that the error happens here:

Dim kbps As Long = kbDownloaded \ Time
        If kbps < 1024 Then
            Label5.Text = String.Format("Download Speed: {0} KB/s", kbps)
        Else
            Label5.Text = String.Format("Download Speed: {0:0.00} MB/s", kbps / 1024)
        End If

So here is what I did to "fix" it (note that I also had to change from backslash "\" to slash "/"):

        If (kbDownloaded / Time) < 1024 Then
            Label5.Text = String.Format("Download Speed: {0} KB/s", kbDownloaded \ Time)
        Else
            Label5.Text = String.Format("Download Speed: {0:0.00} MB/s", (kbDownloaded / Time) / 1024)
        End If

The thing is that right now it gives me a problem with the download speed! If I stop the download and then restart it (from the beginning) the download speed get crazy and it goes like 1kb/s, 2kb/s, 3kb/s, 4kb/s, 5kb/s, 6kb/s,.. and so on.

How is all this even possible?
The program works fine on four different PCs but then it gives that error on three others! Is there a way to fix this problem? I cannot believe that it just random works on some computers and on some other it does not.

One more thing I would like to add is that the versions of windows where the program works are all in English language while the version of windows where the program does not work are all in Italian. Can this make the difference? If so, how can I fix it? I also tried to rebuild the exe on the one pc running windows xp in italian but it did not help! I also tried to rebuild it using visual studio 2010 but no luck

Please help.

Thank you in advance,

Andrea