I have built 4 computers so far and not had any problems but I install the operating system freshly and all the programs after the computer is built, as it is a brand new computer. I don't think you will have to re-install your operating system or your programs as long as you motherboard accepts the new processor, (make sure your motherboard is 100% compatible with the upgraded processor before you try it or you could damage the motherboard, processor or more). Your operating system should detect the changes automatically and should not have any trouble with it. The only thing you might need to do, and might be best to do before upgrading is to upgrade your motherboard bios (by going to its website and downloading a patch) witch might have more updates and allow a upgrade to even a faster processor. Good luck, if you have anymore questions or trouble, please feel free to write to me at firstname.lastname@example.org or post more questions here.