Can't install ANY programs

I have tried to install several different programs into my computer and NONE of them have been successful. I've installed programs before without a problem, this has just started. Sometimes the auto run portion of the program may start, but when it comes to the actual installation process the hourglass thing runs for a couple of seconds and then stops and nothing happens. I end up back at Desktop. Then my computer usually "hangs up" on me.

Here are some of the error messages I have received while trying to install different programs in the last 24hours:

1.Start caused an invalid page fault in module START.EXE

2. Setup caused an exception C0000006H in module SETUP.EXE at 0167:004055d2

3. Error reading CD-ROM Please insert CD ROM....

Any suggestions?

 

What's your Operating System?