When using multiple monitors with a laptop or workstation or even changing monitors, sometimes an application will have been closed in a position that does not exist anymore.  You may or may not be able to see part of the window, but you are unable to grab the top of the window to move it.

There are two ways I have found to get it back.  First, you can try right clicking on the taskbar icon.  If 'move' is an option, click move and use your arrow keys to move the window.

If 'move' is not an option, in trillian for example, right click on your desktop and change your monitor resolution to something smaller while the application is open.  It should 'pop' back into the available desktop.  You can then put your monitor resolution back how you prefer it and you should retain control of the application window.

Many of the new smaller laptops and netbooks do not come with optical drives but you can still install your OS via flash drive.  In fact it is faster to do so in most cases because the random access time on DVD or CDROM drives is so slow.  

Typical access times:

How to prepare USB flash key in Vista or Windows 7 ( advanced ):

• Insert flash key in system with DVD drive and have bootable win7/vista OS original in drive
• Open CMD or Powershell prompt as administrator ( tip right click OR CTRL-SHIFT-Click on any program icon to open as admin )
• type "diskpart"
• "list disk" ( find your flash drive in the list, let's call it '4' )
• "select disk 4"
• "clean" ( WARNING: this will completely clear the disk, make sure you selected correct disk )
• "create partition primary"
• "active" ( mark as bootable )
• "format fs=fat32 quick
• "assign"
• "list volume"  ( I show DVD drive as F and flash drive as H, yours will vary )
• "exit"
• copy files using xcopy /e/f or windows explorer
• "f:" ( your bootable DVD drive )
• "cd \boot"
• "bootsect /nt60 h:" ( to your flash drive )

Once the key is properly bootable, you can change the OS by just copying the files over.  For some reason I have had to repeat the process to get it to work sometimes, so it's possible the sequence is off a bit.  For XP there is an HP utility that works well.