You only fix what's broken. A fragmented file isn't broken and needs no fixing at all. Nothing wrong here.
I have a compaq presario sr1617cl it came with xp home OS. Months ago I requested help and information from cnet forum on replacing and upgrading system. I added 4g of memory, a 500g HD, athlon 64 cpu, and also replaced the XP home version with a legal version of XP Pro. The other day I did a disk defrag on C drive and had 19 files which would not defrag. After many attempts to defrag I went to my computer local disk c properties/ tools/ error-checking and checked; (automatically fix file system error), and also checked; (scan for an attempt for recovery of bad sectors) and restarted pc. After this I ran defra again and have (4 fragments)1MB\documents and settings\all users\application and (7 fragments) 468 bytes \documents and settings\all users\application fragmented files. I then tried to restore to an earlier date and got incomplete restore, which I tried a few different dates all the same results. I then tried sfc /scannow in run with OS CD which left me with the same results 4 and 7 fragmented files. this all started after trying to download two update Belarc Advisor said I didn't have KB2538242 and KB2538243, which after many failed attempts I gave up. I received so much great help before, I will ask again for help. Thank you