''Unable to install. Constrained by certificate''?
Check with your support site, they will have a answer...
UNABLE TO INSTALL UBUNTU 10.04?
10.04 needs more hardware than 9.10. If 9.10 runs slow, then 10.04 will run even slower. It may be that it's too slow to even install properly.
Why Am I Unable to Install a Sound Driver?
A sound driver is the software that tells your operating system how to interact with your specific sound card, therefore it must be installed properly to hear sound.
Unable to install Britannica encyclopedia CD?
Try changing the installation path.If a box appears during the installation process appears which has "Browse..." button next to it, click the Browse button and select another area of your computer...
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I AM UNABLE TO INSTALL ANTI-VIRUS TO MY PC WHAT CAN I DO?
go to http://www.download.com/windows/ and type in AVG8 its free and works great I have been using them for a good 4 years now and have had much success.