My server have blue screen problem.
Someone please help me analysis minidump.

My system is
Win 2003 server standard
Exchange server 2003
Norton Antivirus Corp 7.6
Veritas Backupexec 10

I was able to analyse each of your dump files and looks like they crash when you're trying to launch or using Internet Explorer
Mini082006-01.dmp
PROCESS_NAME: iexplore.exe
MODULE_NAME: nt
IMAGE_NAME: ntkrnlmp.exe
DEBUG_FLR_IMAGE_TIMESTAMP: 42435e60
FAILURE_BUCKET_ID: 0xD1_CODE_AV_BAD_IP_nt!KiTrap0E+2a7
BUCKET_ID: 0xD1_CODE_AV_BAD_IP_nt!KiTrap0E+2a7
CURRENT_IRQL: 2

DRIVER_IRQL_NOT_LESS_OR_EQUAL (d1)
An attempt was made to access a pageable (or completely invalid) address at an
interrupt request level (IRQL) that is too high. This is usually
caused by drivers using improper addresses.
If kernel debugger is available get stack backtrace.
Arguments:
Arg1: 71c106b2, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000000, value 0 = read operation, 1 = write operation
Arg4: 71c106b2, address which referenced memory

Mini081906-02.dmp
The same result as the the first dump

Mini081906-01.dmp
The same as above
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Ok, with what I've gathered, It looks like a memory issue you've got to me.
Suggestions:
1- Looks like you've got 2 memory slots i.e 2 pairs of RAM? Try removing 1 of them(vise versa) and see for a while if it still crashes

2- If method 2 dosen't work - then try running memory diagnostics test on your RAMs. Run the test on each RAms and not on both for a better result. Here's a free tool. Memtest86+ - http://www.memtest.org