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Windows XP was great and still is. If you have a decent motherboard, partition your HDD into two logical drives. Install two copies of Windows XP on each. Store documents in a shared folder accessible to all four Windows XP installations.
SUPER RELIABLE!
If one crashes, you still have three others, and so on.
Windows 7 is for poor motherboards that can't run Windows XP and for pixel-obsessed, low-quality gamers and designers.