Hi Aendni, I know exactly what you mean as recently had some client issues with over 200 xp machines .
It might be of help but I have fixed a few by doing this
1) Stop the ccmexec service (SMS Agent Host) on the machine you have an issue with
2) browse/locate and delete the following file "SMSCFG.INI" (should be located in c:\windows\)
3) Start the ccmexec (SMS Agent Host) service again on the machine and check that the new logs populate c:\windows\system32\ccm\logs (if thats your path)
4) Check SCCM Console for the machine and check if its registered and approved or you can use the "trace" to check the machines log files
5) Check your config mgr client to see if its populated the rest of the services other than the two you mentioned
I have other suggestions if you want to share information
Neilb