please help with crash intepretation

Hello

I have a cisco 2610 that reboot several times today due to watch dog timer. From earlier post , I think I have to replace the OS or the router. I just want to hear some more opinions from the expert. Below is the show ver and show stack

show ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-IO3-M), Version 12.0(5)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) TAC:Home:SW:IOS:Specials for info Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Tue 14-Sep-99 16:13 by jj Image text-base: 0x80008088, data-base: 0x8079DD40

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1) ROM: C2600 Software (C2600-IO3-M), Version 12.0(5)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

Dirm uptime is 58 minutes System returned to ROM by watchdog timer expired at 13:48:53 PDT Wed Jul 25 2007 System restarted at 08:55:05 PDT Tue Jul 31 2007 System image file is "flash:aaa0535.bin"

cisco 2610 (MPC860) processor (revision 0x203) with 53248K/12288K bytes of memory. Processor board ID JAD041303SH (3267730173) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0.

2 Ethernet/IEEE 802.3 interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

show stack Minimum process stacks: Free/Size Name

10168/12000 Init 5488/6000 PostOfficeNet 5360/6000 RADIUS INITCONFIG 7604/9000 DHCP Client

Interrupt level stacks: Level Called Unused/Size Name 1 1033818 7920/9000 Network interfaces 2 0 9000/9000 Timebase Reference Interrupt 3 0 9000/9000 PA Management Int Handler 6 57 8920/9000 16552 Con/Aux Interrupt 7 823422 8916/9000 MPC860 TIMER INTERRUPT

System was restarted by watchdog timer expired at 13:48:53 PDT Wed Jul

25 2007 C2600 Software (C2600-IO3-M), Version 12.0(5)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) TAC:Home:SW:IOS:Specials for info Compiled Tue 14-Sep-99 16:13 by jj (current version) Image text-base: 0x80008088, data-base: 0x8079DD40

Stack trace from system failure: FP: 0x80C43C10, RA: 0x80C43C20

*************************************************** ******* Information of Last System Crash ********** ***************************************************