Am I right in assuming that your log file comes in blocks of 20 lines?

If so, just read in your log file in blocks of 20 lines, put each line in an array and check $array[9]=~m/IC--E/. If this is true, print "@array[5, 15]\n";Perhaps it can look like this:

use strict;
while (1) {
    my @array;
    foreach (1..20) {
        my $line = <DATA>;
        chomp $line;
        push @array, $line;
    }
    print  "@array[5, 15]\n" if $array[9]=~m/IC--E/;
    last if eof;
}

__DATA__
1 Software Package: "xxxxxxx"
2 Operation: install
3 Mode: not-transactional,not-undoable | force
4 Time: XXXXXXX
5 =================
6 WORKSTATION1:
7
8 Distribution ID: `xxxx.xxx'
9
10 Current software package status is 'IC--E'.
11
12 Operation successful.
13
14 Execution of user program 'during_install - C:\Staging\MS07-061_WXP
+_ENU.1.0.1.0\setup.exe (/s)' completed with result: 'success'.
15
16 User program exit code: 0
17
18
19 =================
20
21 Software Package: "XXXXX"
22 Operation: install
23 Mode: not-transactional,not-undoable |force
24 Time: XXXXXX
25 =================
26 WORKSTATION2:
27
28 Distribution ID: `XXXXX.XXXX'
29
30 Current software package status is 'IC--E'.
31
32 Operation unsuccessful.
33
34 Execution of user program 'during_install - C:\Staging\MS07-061_WXP
+_ENU.1.0.1.0\setup.exe (/s)' completed with result: 'success'.
35
36 User program exit code: 0
37
38
39 =================
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