Shrink/Remove dual boot partition Windows XP(or 7)/ RHEL

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http://superuser.com – A colleague has a dual boot laptop with Windows XP or 7 (not sure yet) on one partition and RHEL 5.8 on the second. The RHEL partition is rarely used and the windows partition will soon reach its quota. My colleague has asked if I can shrink or remove the linux partition. As it is not my machine I am quite wary about this as I do not want to inadvertently lose data/system settings that are not my own though I have asked my colleague to backup all essential data on an external hard drive beforehand. What are my options and what are the pitfalls in this process. I assume it will be best to con (HowTos)