depends on the purpose of use
Many people dual boot with Windows. If you are new to Linux I would suggest a drive rack. Slip one hard drive out and slip another in for a different operating system. Never ever any conflicts
Few difference between Windows and Linux
#1: Full access vs. no access
#2: Licensing freedom vs. licensing restrictions
#3: Online peer support vs. paid help-desk support
#4: Full vs. partial hardware support
#5: Command line vs. no command line
#6: Centralized vs. noncentralized application installation
#7: Flexibility vs. rigidity
#8: Fanboys vs. corporate types
#9: Automated vs. nonautomated removable media
#10: Multilayered run levels vs. a single-layered run level
read here for full details http://blogs.techrepublic.com.com/10things/?p=406
this can be more helpful link for you http://www.control-escape.com/lx-win-faq.html