Can't logon to Windows XP to deleted some registry

Question

I use Malwarebytes Antimalware regularly http://www.malwarebytes.org/mbam.php and havent had an infection found.
In about a year.
Yesterday i scanned after about a month and i saw 12 infections !
MBAM said it could not clean a few infections:
Malwarebytes' Anti-Malware 1.44
Database version: 3510
Windows 5.1.2600 Service Pack 2
Internet Explorer Unknown
9/11/2010 11:19:49 PM
mbam-log-2010-09-11 (23-19-49).txt
Scan type: Quick Scan
Objects scanned: 94917
Time elapsed: 2 minute(s), 49 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 2
Registry Values Infected: 2
Registry Data Items Infected: 3
Folders Infected: 1
Files Infected: 4
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\Cur rentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6}
(Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft\Windows\CurrentVersion\Explo rer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6}
(Backdoor.Bot) -> Quarantined and deleted successfully.
Registry Values Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run\mp3_audio_codec (Spyware.Zbot) -> Quarantined and
deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\uid (Malware.Trace) -> Quarantined and
deleted successfully.
Registry Data Items Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Spyware.Zbot) -> Data: c:
\windows\system32\sdra64.exe -> Delete on reboot.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Spyware.Zbot) -> Data:
system32\sdra64.exe -> Delete on reboot.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Hijack.Userinit) -> Bad: (C:
\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32 \sdra64.exe,) Good: (Userinit.exe) -> Quarantined and deleted
successfully.
Folders Infected:
C:\WINDOWS\system32\lowsec (Stolen.data) -> Delete on reboot.
Files Infected:
C:\WINDOWS\system32\lowsec\local.ds (Stolen.data) -> Delete on reboot.
C:\WINDOWS\system32\lowsec\user.ds (Stolen.data) -> Delete on reboot.
C:\WINDOWS\system32\lowsec\user.ds.lll (Stolen.data) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\sdra64.exe (Spyware.Zbot) -> Delete on reboot.
So i thought of manually removing the infected Registry keys. (Something i've done many times before)
While I was at
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\
I saw a key named 'Special Accounts', it looked fishy to my paranoid eyes.
Had some 'strange' values in it, none corresponding to my Username (Administrator) or Guest. 3 were somewhat random letters with a ~, and one was 'search assistant'.
Looked like malware remains of some kind, so, i deleted them all.
After that i rebooted, the welcome screen showed up (usually straightaway shows me desktop since there is just one user 'Administrator') with the only user 'Administrator'.
When i click it, it shows 'loading your personal settings' for a second. Then it reads 'saving your settings' and stays at the logon screen. Repeated it for 10 times. Restarted and repeated. Shut Down and repeated.
Always same result.
Then i tried the 'Last Know good configuration' in statup options. Still same result.
Tried 'Safe Mode' starts loading then breaks at 'unable to load NTFS.dll'
'Safe mode with networking' same logon screen and same one second login and return to logon screen.
I dont know how to login. Can someone please help. Is there a way to remotely add the keys back to my registry. Or some way to correct this problem?
Thanks and Regards
guptavis

Answer 1

Hmm I think Jeka is right
The best, easiest and safest way to get rid of this issue is a new OS installation.
You could also try to repair the registry and to clean the OS files using CCLeaner (its free) but Im not quite sure if this would help you
So new OS installation seems to be a good choice because the HDD would be formatted and all trojans, malware, viruses, which were not detected by other scanns, would be deleted too.