I did the upgrade from Win98 to XP.. not a problem at all. I lost maybe a crappy antivirus program, and some other crap I didn't use anyways. But if you're like me, and goin' in for the long haul, convert your system drive to NTFS. Any others don't matter that much, but the root drive, from my experience, needs to be NTFS.
A+ Core Hardware, Software Certified (May 13 2005)
the new beast...
AMD Athlon XP 3200+ Barton running at 2.16 Ghz.
GeForce MX 4000 (mainly takes the load off the main system)
Creative Labs Audigy 24-bit sound.
Some Case from tigerdirect
512 MB Ultra DDR RAM.
80GB Seagate HDD
LiteOn CD-RW / DVD ROM drive.
currently looking at a litescribe drive at staples, due to its ability to label the CD shortly after being burned.