There are a few different things that may be causing the problem.
1) You have a defective mouse - Replace it.
2) The surface you're using is not reflecting the laser properly (glass?) - Use a mousepad
3)The driver files are not working properly - Start-> Control Panel-> Mouse-> Hardware-> Select mouse-> Properties. Then check all of the driver settings. You can also update the driver from here or roll it back to a previous version (if you recently updated and then began to have issues).
Its ugly
the pointer on the computer screen is called "cursor"
FunWebProducts contain a lot of adware and occasionally spyware. Many anti-virus programs will recommend you to remove it. Cursor Mania can be very annoying and hard to completely remove after installation. You really should stay away from things like Cursor Mania and Smiley Central etc, they are no good and full of adware.
cursor
When you get your computer your cursor should be normal but if its not its not right. [Ej Chapman wrote this answer.]
The mouse or the touch-pad controls the cursor.
A blinking object to indicate where to type is called a cursor. The mouse pointer is also called a cursor.
A Curser, Maybe .. ?
cursor
cursor
Start, control panel, mopuse and from there :)
You can always see your cursor in guildwars unless there is a virus or bug in your computer.