Assuming you're talking about incorrect default file associations in Windows XP... Right click on the PHP file. Go to Open With > Choose Program. Select Wordpad or your fav PHP IDE and tick the "Always open this type of file with this program" box.
First, make sure the files you have are ABR files, they are the proper photoshop brushes files. Then, go to: My Computer>Local Disk>Program Files>Adobe>Photoshop>Presets>Brushes and paste the ABR file/s there. Hope this helps.
TIFF files are image files. They need to be opened in some type of image viewing program or image editing program like Photoshop.
Camera RAW is separate program but ships with Photoshop. Camera RAW is originaly created to work with RAW files but with time it become good program to edit JPEG and TIFF files. You can work with photos inside Camera RAW to correct colors and in addition Camera RAW creates masks for you when you want to adjust portion of image.
A program is essentially a set of files. To remove a program that "Add or Remove Programs" cannot find, you need to delete the files. If you cannot find those files, it is likely that the program has already been uninstalled.
Go to C:\Program Files\Adobe\Adobe Photoshop CS5\Scripting in Windows XP or find Photoshop\Scripting folder on your computer for detailed information's.
copy brushes and go to C:\Program Files\Adobe\Adobe Photoshop CS4\Presets\Brushes and paste there.it will work and for other versions of Photoshop
cCleaner is a good program to remove cache files along with other temporary files and invalid registry keys.
PSD files are Adobe Photoshop Document files. PSD files can be opened and edited with Adobe Photoshop, Adobe Photoshop Elements, and will also work with Corel's Paintshop Pro tool.
PSD is native Photoshop Document.
add or remove programs
No. A Photoshop file would have .psd. .jpg is a standard format for photos. Files can be converted from one to the other easily with the Photoshop program.
"C:\Program Files" for Windows XP, and I think* it's "C:\Users\*YOUR-USERNAME*\Program Files" So for example if you install Adobe Photoshop on Windows XP, it'll be found here "C:\Program Files\Adobe". And just like Photoshop, some other softwares or games that have company will be found in their compnay name's folder before them, for example: "C:\Program Files\id software\Quake 4\..." or "C:\Program Files\Valve\Left 4 Dead 2\..." And there are executables anf 'dll' and 'ini' and weird folders inside. Good luck.