The first error is nothing to worry about, although it indicates a misconfigured server, the second error is explained in http://support.microsoft.com/default.aspx?scid=kb;en-us;329641 which is more serious and may indicate a corrupt registry, correcting this may resolve the first problem. If you have a BDC, clean install it, migrate all data and promote it to PDC. If not, check your backups......
cheers,
10forcash
cheers,
10forcash