When installing, it should ask you if you want to keep the old system or not. If you choose to keep the old system, should automatically set up dual boot. If the installer does not have this option than you will have to download a dual booter. Just remember when installing the second operating system to put it on a DIFFERENT partition than the first one.
This is a bug in a given application. The specific memory address 0x00000000 is known as NULL. A reference to this NULL pointer can be caused by many internal errors in the program. The only two possible resolutions for this error are a vendor patch, and to install more memory. The latter of which is no guarentee that the issue will be resolved.
From what I can tell, your PC is probably infected with Sasser worm or another virus. Google 'lsa shell error' to find downloads of fixes.
If you are using any of the Windows based Media Players, then Album Art is part of the song/album information that is embedded into the digital information of the song/album. The album Art is a recreation of the Album/CD cover for the album. This information, along with Artist, Title, Track time and other info is stored on newer (1999 +) CDs ad part of the CD. Other information can be/will be obtained from the internet when you are running Windows Media Player and connected to the internet. Hope this helps you understand.
This is the typical result of the 'Blaster Worm', look up a fix for it and see if your problem goes away.