5 simple question

1. The yellow window number 2 shows you the version of Mac OS X (here it is 10.6.3).


2.
Applications / Utilities / Grab or CMD+SHIFT+3 or CMD+SHIFT+4 or CMD+SHIFT+4, then SPACEBAR.
Or search.

3.
Drag it to the Trash.
Or search.

4. System Preferences > Exposé & Spaces > Exposé >> Hot Corner or mouse/keyboard shortcut

5.
Those are disk images (.dmg) you mounted after you downloaded them and now use to run the applications from.

Normally you download an application, open the .dmg and drag the application to the Applications folder, then eject the .dmg file and delete it.




Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.

Mac OS X Basics

Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows​

Mac 101 - How to get started with Mac OS X​

Find out how - tutorial videos made by Apple on how to do certain thing in Mac OS X​

Pro tips - tips made available by Apple for easier ways of doing certain tasks​

Mac OS X Keyboard Shortcuts - Learn about common Mac OS X keyboard shortcuts.​

Mac OS X Beginner's Guide by MacRumors - learn about software, media players, shortcuts and some useful tips, tricks and hints​

Mac Guides - tutorials, product guides and more​

Mac Guides - Finding Mac Software​

MRoogle - a very effective tool to search these fora using Google and made available by edesignuk, introductory threads: 1, 2 and 3​

"How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006​

 

You might want to check out Mac Rumor's Beginner's Guide to Mac.

1. Apple menu, About This Mac.

2. Screen grabs.

3. Uninstalling Applications

4. Choose Finder, then from Finder menu, choose Hide Others.

5. Installing Applications. (this is linked to your problem of not installing them properly)

 

Q1: Click the in the upper-left. Then click "About this Mac"

Q2: I like to use shift-control-command-4, and select the area I want to screen shot. This copies the snip into the clipboard. Omit the Control key, and it will save the snip as a file on your Desktop. Shift-Command-3 snaps the entire screen to a file.

Q3: Simply drag it to the trash. Or control-click ("left click") on it, and click "Move to Trash". Note: Some programs, like HP Printer all-in-one packages, have an actual uninstaller.

Q4: I don't use a short cut, but I do use Spaces. Look in System Preferences, Expose & Spaces. Enable Spaces. I use the upper-right corner of my screen as my "hot" area to activate spaces -- it brings up all 4 desktop areas. I simply choose one. The apps running in the other Spaces are undisturbed.

Q5: Sounds like they are running from DMG files, the originally-downloaded files. Find that DMG, control-click, and chose Eject.