Yes by using a usb flash drive.
You can install Windows 7 from optical drive (CD, DVD), hard drive (a local copy), network or USB device.
Yes, if the computer is connected to a network there are options for installing Windows that way.
You can install it from a flash drive or through network.
A optical drive is essentially what you put CD's DVD's and install discs into.
You can install Windows or Linux using a USB memory stick.
Unless you already have a free partition on your hard drive or an additional hard drive, you cannot install Red Hat Enterprise Linux without "disturbing" Windows; you will need to resize the Windows partition to make room.
1.
It is possible, using a USB drive, however I am unsure fo how it would be done. I am sure that there are instructions online...
The most likely reason is that the drive was formatted with a Linux file system. Reformatting the drive to NTFS or FAT32 will make the drive usable in Windows. You could also install an ext4 driver in Windows to access the drive without reformatting it.
No. After download and burn the Ubuntu 10.10 install disk, you can either TRY Ubuntu without affecting your Windows at all, or INSTALL Ubuntu to have them both in your PC. However, to install Ubuntu, you need to be careful. Make sure not to install Ubuntu to the Windows drive. That is all.
No, XP will format the disk if that's needed.
Did you format your hardrive? If you did than windows isn't on the machine anymore. You will have to install the OS again.