Vista Windows Security Center Reports No Firewall/Malware Protection

If you have antivirus/firewall/antispyware software installed in Windows Vista and previously Windows Security Center detected it correctly and now it doesn't, then do the following :

1. Click Start and type cmd in Start Search
2. Press Ctrl-Shift-Enter
3. Click Continue when prompted by User Account Control
4. cd wbem
5. net stop winmgmt /y
6. ren repository repold
7. net start winmgmt
8. exit
9. Restart computer