That's an EXPECTED error in some situations. There is NO CURE! If chkdsk is clean, then ERROR 993 is expected when you use such a check in the OS as noted at
That was 7 years ago and is not going to be fixed. We hope folk can catch up on why it happens but it does and that's that. Sorry if this sounds harsh.
Items 2 and 3 sound like rootkit or other issues. Here's a QUICK TEST I perform. Go get RKILL as noted by Grif and tell me the output.
Grif writes more at http://forums.cnet.com/7726-6132_102-5098912.html?tag=posts;msg5099421
I am working on a friends computer. I have never seen anything like this before.
I believe this is a virus. Symptoms include:
1) error 993 on C drive. A recovery CD of XP and chkdsk /p and chkdsk /r find problems, but still get error 993. Re checking the disk says no problems but error 993 still exists.
2) XP Services will on their own suddenly change to disabled. Even the sound drivers!
3) If I copy or download any files to the HD, it will download, but then disappears. You can actually watch this happen with windows explorer. I have to copy files to a thumbdrive and then load them from there.
I have tried just about every antivirus, adware and malware software with no effect. I have had some things that may have contributed to this. The friend had a few internet search bars, including Yahoo and Babylon. This has help with some stability, but these 3 items are still a major concern.
Thanks for help!