Do the upgrade, just to be up to date with everything. I just recently went from Windows XP to Windows 7. I refused to get Windows Vista because of how many flaws it had. Im loving my Windows 7 more than anything in the world.
If you want to use windows and save your money, i can help you. i can re-sell my key for windows 7 ultimate with a low price $36. Thanks you. Contact me
Windows 7 has a totally revamped kernel (since the time it released Vista). Looks like the Vista Kernel had too many bugs. But the totally revamped kernel of Windows 7 fixes all those bugs. Similarly, the windows 2008 server had a similar buggy kernel as Windows vista. Hence they release Windows 2008 R2 which has a similar kernel as that of Windows 7. Windows 7 and Windows 2008 R2 are by far the best OSes released by Microsoft and I highly recommend them from my personal experience with them so far.
If you don't know the advantages of 7, you can't know if 98 is 14x better or not. 7 is better than vista as it handles resources better making it faster, and more reliable. Also, it is infact better than 98 as it uses NTFS file system, its' security is far better, and it is able to use the latest hardware and software easily.