[En-Nut-Discussion] Fuses

[vf]

Hi!

My AVRStudio can read flash and eeprom. But after programming it says: 

"FLASH contents differs from file."

Besides there is a questionmark at Fuses-Tab at the point:

Serial program downloading (SPI) enabled; SPIEN=0


Does this mean that any further programming via ISP is not possible?
Can I solve the problem (set the fuse back) with a JTAG programmer?


Could it be, that this code is the source of my problem?

main(){
DDRB=(1<<DDB2)|(1<<DDB1)|(1<<DDB0);
SPCR=(1<<SPE)|(1<<MSTR)|(1<<SPR0);
}