Slow bootup since firmware upgrade (Medion/Pioneer DVR-107d)

Hi,

I installed Official Pioneer firmware v1.16 on my DVR-107d, but my pc boots up real slow since that change...
It is a medion pc, so i had to overwrite the medion kernel... The firmware upgrade was succesfull...

What can i do to make it boot fast again, since i can't find any firmware from medion itself?

I've read a couple of possible solutions:
- remove CMOS battery for a while
- full new windows xp install
- Pull out the plug, hold the on switch for 10 seconds, then put the plug back in and start the pc.
- ...

If anyone could help me, i'd appreciate it...