We don't know anything about your system, your Internet connection and whatnot... Most likely you simply made a mess by updating e.g. Acrobat and it updated something and introduced an incompatibility. In that case you can only start from scratch after running the cleaner tool.
Mackbook Pro (mid 2009)
Mac OSX 10.1 Yosemite
Wireless connection via Asus RT66 router (fibre)
Adobe Photoshop CS5 Extended
version 12.0 x64
I have done a complete uninstall, and re-install only Photoshop. Right after installation, I did updates and still get error messages as before.
Hope this info is enough.