I would leave the ntuser.dat file alone. See here and here.
Thanks for the quick reply.
I actually had seen both those links before I asked the question here and the reason I asked the question was there seemed to be conflicting information about what is in the NTUSER.dat file. Some sites say it is profile information only, others say it contains browsing history. I don't mind rebuilding my profile on occassion if it preserves privacy of browsing, but I don't want more work than is necessary. If it does contain browsing history then every bank and brokerage company, etc I use is in that history and I'd just as soon that it didn't.