NTDLL.dll error

Hey guys,

Since a couple of days I have a really annoying error when opening FL Studio 10 (digital music producion software). I run Windows XP SP3, clean install about 2 months ago.
error: "FL.exe - entry point not found. The procedure point Ntalpcsendwaitreceivepoint could not found in dynamic library ntdll.dll"
The error pops up about 8 times, while FL Studio starts up. After clicking away the errors, everything seems to work normal. It only pops up again when I try to load a synthesizer-plugin e.g.

I figured two possible causes:

1. Virus/malware (altough my AVG said I was clean)
2. Driver issues/conflicts

Things I already tried, but didn't work:
1. Virusscan and registry-scan/repair
2. SFC /SCANNOW
3. System restore
4. Reinstalling FL Studio 10 / Asio4all-drivers / Midi-keyboard-drivers
5. Replacing my NTDLL.dll with the original from my XP-cd

After that I found this post on another forum: "I get a "FL.exe - entry point not found Ntalpcsendwaitreceivepoint not found in ntdll.dll" message when i open FL, add synths and various other operations. Everything works, I only get this message that i have to click every time. I uninstalled, reinstalled cleaned registry. used system restore... I started getting this message after I installed samsung kies for mobile and it installed some codecs for video with it."

Then I realized that the problem also started with me after installing Samsung Kies (software for my Galaxy S2 phone) & including audio/video-codecs. I tried uninstalling Kies and the codecs (and cleaned up registry), but the problem keeps persisting.

I'm really trying to avoid a clean install, mainly because I'm afraid the error will reoccur after I install the same progs again.
If you guys could be of any help to solve this error it would be much appreciated! Thanks