You probably neglected to install a driver for your sound card. Download one from your manufacturer's website.
Try reinstalling the driver for the CD drive
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.
As long as they use the same data connector, yes. However, you will likely not be able to use the hard drive, as Windows XP will not usually work when transferred to another computer, and Windows Me cannot read the NTFS file system. Reinstalling Windows XP or formatting the hard drive in Windows Me will resolve these respective issues.
No. Unless you are making major changes to your system's hardware, for example, replacing the hard drive, proccessor and motherboard at the same time, reinstalling the OS is not necessary. Sometimes even making major changes to the hardware will work ok without any reinstalling. The exception being if you replace the hard drive that contains the OS.
If Mac: CD Reader, A-4 microchip, speakers, motherboard, hard drive Windows: Not Sure
Find a computer where you can add a password in the bios. Doing so, you can setup your bios to boot from hard drive first before booting from the DVD drive. No windows install DVD will be able to re install windows since the hard drive will boot first.Then, in windows, setup you account as admin and add a password for it if there is no password. Setup a guest account for other windows users. That's it.
On C drive is where your Windows and program sis installed. So proably it won't do without reinstalling them.
Take the CD out of the drive.
Yes. Just uninstall any programs you don't use and delete any files you don't want to back them up to another disk.
If you mean that you have formatted the hard-drive... you cannot 'undo' it. Wiping the hard-drive erases the reference track from the drive. The reference track holds details of all the programs, pictures and personal data - to allow Windows to find each file as required.
There are many ways to clean the data on a hard drive disk. These ways include erasing and formatting, data wiping aka data dump, and disk wiping stands.
You can certainly move Windows to an external hard drive but Windows will not boot directly from an external drive. If you are running Windows in Parallels (See links below) you can have Parallels installed on the Mac's drive and then have your Windows virtual machine on the external drive.