Sorry your having a tough time with this, I would do both what thousand and bits said, but also add this into it just to be safe.
Download OFW 3.55 and hold down your ps3 button it will beep once then beep again and shut down, do it again and it will beep once then beep three times. Let the button go then because your in recovery mode. Install the Official firmware there. Restart then install Kmeaw 3.55, or Rebug 3.55 (and new patch) Restore file system like bits said, and reinstall BDEMU2, MultiMan, and what ever else you use.
Now give it a shot.
(Yes this is a labtop)
Windows 7 Ultimate 64bit(Legit)
Intel Core i7 (8 threads) 2.30-3.6GHz
DDR3 8.00GB Random Access Memory
SSD 256GB average write 256.7MB/s read 230.2MB/s
GeForce GT 540M 2GB DDR3(Optimus)
Intel(R) HD Graphics 3000 4GB Max Graphics Mem
BluRay, DvD, CD Burner/Player