Itunes 10.5 DMG won't open, itunes 10.5 DMG won't open, itunes 10.5 DMG won't open

Question

Downloaded itunes 10.5 dmg
open it after download
chesum error shows
when skipping de cheskum check
and installing itunes it won't install!
in console the description beneath shows.
Can some one please help me?
12-10-11 23:27:33,449 installd: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=110 "An error occurred while extracting files from the package “Install iTunes”." UserInfo=0x7f9982c66de0 {NSLocalizedDescription=An error occurred while extracting files from the package “Install iTunes”., NSFilePath=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root, NSURL=file://localhost/Volumes/iTunes%2010.5/Install%20iTunes.pkg#CoreFP1.pkg, PKInstallPackageIdentifier=com.apple.pkg.CoreFP1, NSUnderlyingError=0x7f9982e15e80 "The file couldn’t be opened because it isn’t in the correct format."} {
    NSFilePath = "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root";
    NSLocalizedDescription = "An error occurred while extracting files from the package \U201cInstall iTunes\U201d.";
    NSURL = "file://localhost/Volumes/iTunes%2010.5/Install%20iTunes.pkg#CoreFP1.pkg";
    NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=259 \"The file couldn\U2019t be opened because it isn\U2019t in the correct format.\"";
    PKInstallPackageIdentifier = "com.apple.pkg.CoreFP1";

Answer 1

Do you have QuickTime installed? If not, install it or Repair it.
To Repair, START/CONTROL PANEL/PROGRAM n FEATURES/highlight QUICKTIME and click REPAIR.
Another thing to check is see whether your system is clear of Malware but you have to SCAN it in a SAFE Mode:
Start your computer in "Safe mode with networking", go to CNET's download.com to download a free version of Malwarebyte. Install and perform update immediately, then do a full SCAN. Remove malware if it indeed finds any. Restart computer to regular windows to let Malwarebyte complete the removal.
To start your computer in safe mode
Restart computer
Press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you'll need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer. 
On the Advanced Boot Options screen, use the arrow keys to highlight the "safe mode with networking" option, and then press Enter. 
Log on to your computer with a user account that has administrator rights.
When your computer is in safe mode, you'll see the words Safe Mode in the corners of your screen. To exit safe mode, restart your computer and let Windows start normally.