If you do a clean install, yes. Everything is lost, and you end up with what would be considered a clean, out-of-the-box PC. If you, however, do an upgrade, everything is transferred over.
Skype chats aren't "saved" when you switch computers. Therefore, if you chat to a person on Computer 1, but switch to Computer 2 halfway to continue chatting with the person, the history is not saved.
Yes, but it's kind of weird where they are saved. See https://support.skype.com/faq/FA1358/Where-is-the-video-snapshot-saved-in-Skype-4-1-for-Windows?frompage=search&q=video+snapshot
Reinstalling Windows will not erase the hard drive unless you tell it to reformat the hard drive before reinstalling the operating system. You will have to reinstall all your programs that were installed prior to reinstall but all your saved files will still be there.
it currently does not exist
In exchange 2007 all the exchange attributes are saved in AD. Once you reinstall new windows server and exchange, it copies the configuration data from AD.
Not unless you install a Windows or Mac operating system onto your console, in which case all you have to do is uninstall and reinstall it because the virus can't be saved on the PS3 harddrive.
Yes, YOur saves will still be there because the saved Games folder stays in your registry, so if you reinstall, that folder will not be harmed.
Only if you've saved your SHSH. If you don't know what that is then no sorry.
assuming you have windows it would be saved here. c:\windows\profiles\user\my documents\downloads
Webcam chats with friends and family are not saved to a computer, only things you have recorded through webcam are saved e.g. If you and a friend decide to make a webcam video about yourselves it will save but a webcam videocall will not save.
No reason why not - providing the document was saved in a format OpenOffice can read. Windows 7 is the operating system - OpenOffice is a program.
The best one is definitely a reinstall. You can how ever try booting a operating system from DVD to access your files. A few repairs can also be done by booting a Windows 7 DVD. Read up on "bootrec".