Thank you for the quick reply! I really apreciate it!
Well, the first time I had the NTRDL error (back in February) it came out of nowhere. I'd been up and running for about 6 weeks. I have no partitions on either disk. The only possible causes I can think of are: installing 2 'all in one' codec packs, and then trying to uninstall them. After install, some of my other programs (SoundForge, nTune, etc) required reinstall before I could use them again, due to missing files; I turned off Silicon SATA controler in BIOS to get rid of the RAID options at startup; I had to system restore after Windows update due to disk instability about 2 weeks before that initial error. That's really all I can think of, besides having 2 sets of drivers installed accidentaly a long time ago, as I mentioned above.
This time (yesterday), I can't think of anything that could have caused it. Only been installing things like iTunes and downloading some bittorrent files as per normal. As per my link above, I am running ZA 5 firewall and KAV 5 and AdAware (scan regularly). I also ran a Seatools diagnostic on both drives and they came out OK. The only thing I can think is that it's more A8N shenanigans, or my Windows Media Center disks have some kind of damage. I have a copy of XP Pro on another machine that works well, so I could try that, but I really don't want to if I can help it for various reasons .
How about this solution which another poster mentioned?-
Insert and boot from your WindowsXP CD.
At the first R=Repair option, press the R key
Press the number that corresponds to the correct location for the installation of Windows you want to repair.
Typically this will be #1
Enter in the administrator password when requested
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:
Take out the CD ROM and type exit
Any ideas?