After I had my virus problems earlier this month, I was glad that I hadn't bothered to wipe Windows 98 off of my hard drive after I installed XP, since I was able to contain and eliminate the virus by booting into 98, which wasn't contaminated; Problem is, although I could use 98 as a stable platform to run a virus scan, I couldn't scan the majority of my disk space, since that was on NTFS.
As a solution to this issue, I've decided to install Windows 2000 Professional overtop of Win98 and convert all of my drives to NTFS. However, I don't have a lot of disk space to spare, so there's no way I can back up my entire C drive.
Win2k doesn't support upgrading from 98, so I'll have to do a clean install--My question is: Will installing Windows 2000 (Pro, not Server) erase or modify anything on my c: outside of the Windows directory? Also, will it overwrite the bootloader in a manner that will prevent me from booting into XP?