LCD Clock, Interrup

I have the following

Clock on LCD LINE 1 Timer0 overflow Interrup
Line two I measure temp and voltage with different pushbuttons

Clock stop when I do measurement
Can get voltage to display correct but then temp is not correct or visa versa
How do I nest something outside the interrup toovercome the clock stopping

Problem with setup of ADC

Help
'************************************************* ***************
'* Name : lcdclocktemp001.BAS *
'* Author : P van Biljon *
'* Notice : Copyright (c) 2006 Ver:2.44 *
'* : All Rights Reserved *
'* Date : 2006/07/15 *
'* Version : 1.0 *
'* Notes : *
'* : *
'************************************************* ***************
' LCD clock program using On Interrupt
' Uses TMR0 and prescaler. Watchdog Timer should be
' set to off at program time and Nap and Sleep should not be used.
' Buttons may be used to set time
DEFINE LOADER_USED 1 ' If using bootloader to program pic
DEFINE LCD_DREG PORTC 'Define PIC port used for LCD Data lines
DEFINE LCD_DBIT 0 'Define first pin of portc connected to LCD DC4
DEFINE LCD_RSREG PORTC 'Define PIC port used for RS line of LCD
DEFINE LCD_RSBIT 4 'Define Portc pin used for RS connection
DEFINE LCD_EREG PORTC 'Define PIC port used for E line of LCD
DEFINE LCD_EBIT 5 'Define PortC pin used for E connection
DEFINE LCD_BITS 4 'Define the 4 bit communication mode to LCD
DEFINE LCD_LINES 2 'Define using a 2 line LCD
DEFINE LCD_COMMANDUS 2000 'Define delay time between sending LCD commands
DEFINE LCD_DATAUS 50 'Define delay time between data sent.
DEFINE ADC_BITS 10 ' Set number of bits in result
DEFINE ADC_CLOCK 3 ' Set clock source (3=rc)
DEFINE ADC_SAMPLEUS 50 ' Set sampling time in uS

hour var byte ' Define hour variable
dhour var byte ' Define display hour variable
minute var byte ' Define minute variable
second var byte ' Define second variable
ticks var byte ' Define pieces of seconds variable
update var byte ' Define variable to indicate update of LCD
i var byte ' Debounce loop variable
samples var word
sample var byte
temp var byte

sample9 var word
@ device WDT_OFF

Pause 100 ' Wait for LCD to startup

hour = 0 ' Set initial time to 00:00:00
minute = 0
second = 0
ticks = 0

update = 1 ' Force first display

' Set TMR0 to interrupt every 16.384 milliseconds
OPTION_REG = $55 ' Set TMR0 configuration and enable PORTB pullups
INTCON = $a0 ' Enable TMR0 interrupts

On Interrupt Goto tickint
PORTB = 1 ' PORTB lines low to read buttons
TRISB = %11111111 ' Enable buttons
mainloop:
' Check any button pressed to set time
if PORTB.1 = 0 then decmin
if PORTB.2 = 0 then incmin
if portb.3 = 0 then temp1
if portb.4 = 0 then loop
'disable

'enable

' Main program loop - in this case, it only updates the LCD with the time

' Check for time to update screen
chkup: If update = 1 Then
Lcdout $fe, 1 ' Clear screen

' Display time as hh:mm:ss
dhour = hour ' Change hour 0 to 12
If (hour // 12) = 0 Then
dhour = dhour + 12
Endif

' Check for AM or PM
If hour < 12 Then
Lcdout $fe,1," ", dec2 dhour , ":", dec2 minute, ":", dec2 second, " AM"
Else
Lcdout $fe,1," ", dec2 (dhour - 12), ":", dec2 minute, ":", dec2 second, " PM"
Endif

update = 0 ' Screen updated
Endif

Goto mainloop ' Do it all forever

' Increment minutes
incmin: minute = minute + 1
If minute >= 60 Then
minute = 0
hour = hour + 1
If hour >= 24 Then
hour = 0
Endif
Endif
Goto debounce
return
' Decrement minutes
decmin: minute = minute - 1
If minute >= 60 Then
minute = 59
hour = hour - 1
If hour >= 24 Then
hour = 23
Endif
Endif
Goto debounce
return
' Debounce and delay for 250ms
debounce: For i = 1 to 25
Pause 10 ' 10ms at a time so no interrupts are lost
Next i

update = 1 ' Set to update screen

Goto chkup

'sample1 var byte

loop:
trisa = %11111111
adcon1 = %10000010

pause 500

adcin 2,sample9

sample9 = (sample9 */ 500)>>2
'samples = samples * 2
lcdout $fe,$C0,"Voltage is: ",DEC (sample9/100),".", DEC2 sample9
pause 1500
goto mainloop

temp1:
TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000010 'Set to analog ports A
'samples = 0

loop1:

'for sample = 0 to 20
adcin 4 ,temp
'samples= samples + temp
'pause 50
'next sample
'temp = samples / 20
temp = (temp */ 500)>>2
lcdout $fe,$C0,"Temp is: " ,DEC temp,".",dec1 temp," C In "

pause 1000
goto mainloop

' Interrupt routine to handle each timer tick
disable ' Disable interrupts during interrupt handler
tickint:
ticks = ticks + 1 ' Count pieces of seconds
If ticks < 61 Then tiexit ' 61 ticks per second (16.384ms per tick)
ticks = 0 ' One second elasped - update time
second = second + 1
If second >= 60 Then
second = 0
minute = minute + 1
If minute >= 60 Then
minute = 0
hour = hour + 1
If hour >= 24 Then
hour = 0
Endif
Endif
Endif

update = 1 ' Set to update LCD

tiexit: INTCON.2 = 0 ' Reset timer interrupt flag
Resume

End