Windows 7: Task scheduler - starting tasks at incorrect times

Hello,

recently I've upgraded my PC, got myself a new MoBo/processor/RAM modules, reinstalled Win 7 Ultimate x64 on top of it, and since then I have a problem with my old "alarm clock" task.
I've set my PC up to wake up from sleep at workdays 6.30AM, and run Winamp with a web stream in the playlist. So far so good. It worked exactly one day after the reinstall,then it went completely nuts (I've updated the BIOS on the new board, the one that was out of the box was over 10 versions behind the new one). Now my PC wakes up early by approx 10 minutes, when I open up task scheduler afterwards, my alarm clock isn't even running, and no winamp started. When it turns 6.30, the task starts normally as if the early wakeup didn't happen.

RTC clock is OK, MoBo battery seems OK too, time zone is set correctly and the correct time is shown in Windows. Event viewer/administrative events doesn't show up any events resembling something related to this error,and not even anything corresponding with the early wakeup time.

Please tell me I don't have to reinstall it again...



Thanks