For some odd reason when i enable the Start Bitcoin on Windows start up by placing tick mark in options & clicking apply, the tick mark vanishes & show without tick mark. Same thing happens if i click OK also.
I am not sure it loads automatically on startup itself, so i now starting up using windows startup folder.

I disabled when i installed Bitcoin 0.5.2 beta & i can't enable now.
May be just GUI problem, not sure.
On WIn 7, 64 bit.