Uhhh details?
It must be program and file corruption if it's true I should recommend you following tool to solve problem out
CS4 is version of software, and the name before CS4 is stand name of Software, for example Photoshop CS4 is: software Photoshop and version CS4. The Name of Software is Photoshop not Photo shop, please don't change. ---------------- If you want to know more about it then open photo shop and click on the help menu and select About Photoshop sub menu and then you will see and Photoshop about window. You can read there more about it.
To open a raw file in Photoshop, go to File Open and select the raw file you want to open. Photoshop will automatically open the raw file in the Camera Raw plugin, where you can make adjustments before opening it in Photoshop.
Find the Adobe Photoshop CS4.exe file and double click on it. To make this process faster, before you click ir, right click on the EXE file and choose create shortcut. Right click on the shortcut and click cut. Go to your desktop and click paste. Then all you have to do is double click on the shortcut and it will automatically open.
To move from Photoshop 7 to CS4 will require a purchased full copy of Photoshop CS4 as there is no upgrade available for versions of Photoshop older than 8 - the first CS version.
Yes, Photoshop is backwards compatible, however, once you save the file in CS5 you will not be able to use it in CS4 anymore. You can use files saved in CS5 in almost any other version and any page layout program which supports psd files, here i mean to save as psd. When saving turn on Maximize PSD and PSB File Compatibility in Edit > Preferences > File Handling.
Photoshop CS4 Bible Check Here http://www.amazon.com/Photoshop-CS4-Bible-Stacy-Cates/dp/0470345179
No
Yes, you can upgrade from Photoshop CS3 (or earlier) to Photoshop CS5 Extended, no problem.
For sure, who will buy new version if can not work with files from previous. You must enable maximize psd file compatibility in Preferences > File Handling or when saving document in Ps CS5 to be compatibile and all features readable in previous versions.
You can open .gif file in Photoshop, to convert it to another format, first open it in Photoshop then go to Save As and choose another format to save. If you cannot open that file in photoshop then See related link for free online file conversion, convert to png, jpg or tiff and you will open file in Photoshop.
save from Corel draw file as psd in order to be able to open it in Photoshop, photoshop doesnt support cdr files
Nowhere, Photoshop is not free software.