Installation Problems

[CalCutta]

Just about every application I try to install comes up with the error message:

The installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows installer package.

How do I fix this problem? I cant get Active Sync, ITunes, Quicktime or other apps installed.

 

[Triple6]

What version of Windows? Have you tried using System Restore to go back to a date before this started occurring?

 

[TJRaYeR]

Make sure you're the administrator and go the right privileges if your running Vista....

 

[immu]

if you want so i would love to help you out with installation issue
i wanted to ask few questions.
1. What is the operating system you are using is it Vista or XP?
1. When was the last time you have installed any program successfully?
2. Have you done any update on your computer?
3. Have you tried the selective startup mode to install program?
4. Have tried in the safe mode to install the program?
5. what is the exact error massage are you getting?
Please provide me these information i will try my level best to fix your issue.