OK, I bricked 2 of these chips now... With this code?

Code:
Capture      VAR PIR1.2              
T1CON.5=1     '1:4 prescaler
T1CON.4=0     '1:4 prescaler
T1CON.3=1     'Timer1 OSC enabled
T1CON.2=1     'sychro clock
T1CON.1=0     'internal clock
T1CON.0=1     'start timer
It works fine until I add the above into my program, then it seems portb.7 gets fried and I have to replace the chip to program again.