Black Screen on Windows 7 startup

Windows 7 desktop can not load after welcome screen appears just a black screen come and stuck a white mouse pointer works but nothing else.

safe mode works and last known good configuration works

whenever i start in above mentioned mode it works and then i had repaired win. 7 startup and chkdsk perform on c drive. then restart the system and it start properly as it worked. But after a day i start same problem came again.

pls. suggest any permanent solution.