If you get an error that NTLDR is not found during bootup,
If you have FAT32 partitions, it is much simpler than with NTFS. Just boot with a Win98 floppy and copy the NTLDR or NTDETECT.COM files from the i386 directory to the root of the C:\ drive.
1. Insert and boot from your WindowsXP CD. 2. At the first R=Repair option, press the R key 3. Press the number that corresponds to the correct location for the installation of Windows you want to repair. Typically this will be #1 4. Enter in the administrator password when requested 5. Enter in the following commands (X: is replaced by the actual drive letter that is assigned to the CD ROM drive. COPY X:\i386\NTLDR C\: COPY X:\i386\NTDETECT.COM C:\ 6. Take out the CD ROM and type exit