Updating/Installing C3 Updates Does not function

Computer is an Apple C5 Desktop, OS 10.5.8, Dual 2.7 GHz, PowerPC, 3.5 GB DDR SDRAM.

I am using Adobe C3 applications which now requires updates.  When an Adobe product needs an update, a notification update dialog appears.  I click ok to download and install Adobe Updates to all my products.  I reviewed the Preferences that indicates all the C3's and a number of others applications.  I click continue and downloading begins.  Installation did not seem to occur or at least there is/was no indication of it other than noticing a percent of completion happening.

The problem is that this process continues and continues and continues over and over each and every time I clicked continue.

When I was able to review the preferences again, I deselected all applicable downloads.  I rthen clicked continue.  Unfortunately the processes continued and continued and continued each time I clicked continue to download but not install to the best of my knowledge.

There were no error messages.

This problem happens for every update download.  I must click cancel in order to halt this process so I can continue computer work.

Please HELP.

Bud Willner