net stop cryptsvc 
ren c:\windows\system32\catroot2 oldcatroot2 
net start cryptsvc 
rem (this will re-register some necessary dll files) 
regsvr32 softpub.dll 
regsvr32 wintrust.dll 
regsvr32 initpki.dll 
regsvr32 dssenh.dll 
regsvr32 rsaenh.dll 
regsvr32 gpkcsp.dll 
regsvr32 sccbase.dll 
regsvr32 cryptdlg.dll