What is the rotating rainbow icon?

So for some reason 90% of the time I go to check my email when I try to click on any thing on the page this rotating rainbow pops up and freezes my computer. The only way to get un frozen is to go back to my home page or if its really bad I have to sometimes turn off my computer and start all over again. What is that icon and what can I do to stop it from happening?

Go to: System Preferences / Accounts / Login Items and check to see how many Application are set to open at Login/Startup.
If you have a lot, remove most or all and see if that helps.
Likewise, look at your Dock and check to see how many App's are open? Open App's will have a small blue light on below them. Also note that unlike older OS X versions, Lion wants to keeps all the App's open that you were using in the last session if you don't uncheck the "Keep Apps open" box when you shutdown.
Also note: that while 4GB is a fair amount of RAM, it is not enough to smoothly run OS X and tons of other App's all at the same time.

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How can I quit my iPhoto screen that as crashed and locked on. The locked screen has no iPhoto file list on the left and the part of the screen that should have uploaded photos is blank except for the rotating download icon in the centre of screen. Help?I

My SD card reader has caused my iPhoto screen to be locked with no list of files on the lefthand side and a blank main photo area apart from the rotating download icon operating in the centre of the photo part of the screen.
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If the problem does not persist try the following: make a temporary, backup copy (select the library and type Command+D) and apply the two fixes below in order as needed:
Fix #1
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Since only one option can be run at a time start with Option #1, followed by #3 and then #4 as needed.
Fix #2
Using iPhoto Library Manager to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option
In the next window name the new library and select the location you want it to be placed.
Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments but not books, calendars or slideshows. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.
If the problem persists in the test library do the following: make a temporary, backup copy (if you don't already have a backup copy) of the library and try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
User/Home()/Library/ Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your
User/Home()/Library/Caches/com.apple.iPhoto folder.
Click to view full size
3 - launch iPhoto and try again.
NOTE: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto. You'll also have to reset the iPhoto's various preferences.
OT

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