Error 1719: Windows Installer Service could not be accessed" while installing Parallels Tools

APPLIES TO:

• Parallels Desktop 7 for Mac

Symptoms

"Error 1719: Windows Installer Service could not be accessed" while installing Parallels Tools in 64-bit Windows virtual machine.

Cause

MSI service settings need to be modified in Windows registry.

Resolution

1. Restart the virtual machine and take a Snapshot in order to create a safe backup.

2. Open Start menu, in Run (for Windows XP) or Search bar (for WIndows Vista and 7) type "regedit".
3. Click on File menu --> Save As and save it in a safe location in Windows guest OS. 
4. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIserver\WOW64



5. Right click WOW64, and select "Modify". 

6. Set Value Data to 0 and Base should be Hexadecimal.
7. Close all the windows and restart the virtual machine.

source: http://kb.parallels.com/en/113631

Reset Safari

1. Choose Safari > Reset Safari.
2. Deselect any items you don’t want to reset:

   Option	Description
   Clear history:	Clears the list of webpages you viewed.
   Reset Top Sites:	Clears any changes you made to Top Sites, such as adding or pinning sites. If you also clear your history, your Top Sites page reverts to showing the webpage previews displayed when you first installed Safari.
   Remove all webpage preview images:	Clears any thumbnail images Safari saved of webpages you viewed.
   Clear the Downloads window:	Clears the list of files you downloaded from websites. Only the names are removed; the files themselves are still on your disk until you remove them.
   Remove all website icons:	Removes website icons, which are small graphics that help identify sites on the Internet. You see them in the Safari address field and bookmarks list, and other places. These icons are stored on your computer.
   Remove saved names and passwords:	Removes user names and passwords that Safari automatically fills in at websites that require them (if the AutoFill feature is turned on).
   Remove other AutoFill form text:	Removes some personal information, such as telephone numbers, that Safari uses to automatically fill in forms on webpages (if the AutoFill feature is turned on). Removing AutoFill information does not remove information from your address book.
   Close all Safari windows:	If you don’t close all Safari windows, someone could use the Back and Forward buttons to view the webpages you visited.
   Reset all location warnings:	Clears any information websites saved about your location.
   Remove all website data:	Removes cookies, tracking information, and other data that websites stored on your computer.

3. Click Reset.

Source: http://support.apple.com/kb/PH5043