Working with the Windows Desktop and File System
93
Copyright © 2005 Heathkit Company, Inc. All rights reserved. Unit 4 Working with the Windows Desktop and File System
Transcript of Working with the Windows Desktop and File System
Copyright © 2005 Heathkit Company, Inc. All rights reserved.
Unit 4
Working with the
Windows Desktop
and File System
2
3
C:\Program
Files\Accessories
\Wordpad.exe
C:\Program Files\
Windows NT\Accessories
\Wordpad.exe
4
5
+
1
2
3
6
+
7
8
9
10
1
3
2
11
12
13
1
2
14
15
16
17
1
2
3
18
19
20
21
22
23
24
25
26
Click right mouse
button on Start
27
Current Disk & Path
28
Selected Disk, Directory or Folder
29
30
The Left
Mouse
Button
Opens the
Folder
31
32
33
34
Navigating Folders
35
36
37
List of Recent Folders
38
39
40
Selecting Files or Folders
41
42
Shift
43
Ctrl
44
Copying Files or Folders
45
46
47
48
Moving Files or
Folders
49
50
51
Searching for Files
52
Still Searching
53
Still Searching
54
55
File Extensions
• Extensions control how a file is
opened.
• By default, you can’t see file
extensions.
• Extensions are displayed for
unregistered file types.
56
The Default View
57
Unhide those Extensions!
58
Unhide those Extensions!
59
Unhide those Extensions!
60
The Safe View
61
Disk Properties
62
More Disk Properties
63
Copyright © 2005 Heathkit Company, Inc. All rights reserved.
Viruses
65
A Virus is...
• An intentionally destructive computer program.
• Human generated vs. machine generated.
• Somebody’s illness they intentionally give to you and hope you pass it on.
66
Targets of a Computer
Virus
Floppy disks HDD Data
ROM BIOS
67
How a Virus Spreads
Hard disk driveHard Disk Drive
Infected
Floppy Disk
Virus
Virus
Virus
Floppy Disks
Virus
68
How a Virus Spreads
Hard disk driveHard Disk Drive
Virus
Virus
Virus
Floppy Disks
Virus
From Network,
BBS, or Internet
69
Where Viruses Hide
• Executable files (Parasitic Virus)
• The hard or floppy disk DOS Boot
Record (Boot Sector Virus)
• Hard disk partition record
continued...
70
Where Viruses Hide
• Added to end of legitimate
program.
• In unused memory areas
• In a disk sector.
• In memory - TSRs
71
Parasitic Viruses
Attach themselves to
executable programs and
do their dirty work when
that program is run.
72
Boot Sector Viruses
Loaded into memory when
the computer boots from an
infected disk.
73
Common Virus Types
• Worms
• Trojan Horses
• Bombs
74
The Worm
Worm
75
The Worm
Worm
Worm
Worm
76
The Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
77
The Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
Worm
78
The Trojan Horse
TNT
79
The BOMB
Monday, August 5
80
TNT
Worm
Worm
Worm
Worm
Worm
Worm Trojan Horse
Bomb
Monday, August 5
81
Not all Viruses are
Destructive
82
How a Virus Works...
• Your system “catches” the virus.
• The virus activates.
• The Worm spreads the virus
83
Macro Virus• Probably most common virus today.
• Open doc with Macro and you’ve got it.
• Often found in Word and Excel docs.
• Written in the app’s macro language.
• Easy to spread.
• Transferred over the internet.
• Macro languages are easy to learn.
84
Preventing Viruses
Preparing for the Virus
Attack that will Strike
Sooner or Later
85
Virus Protection is a Tradeoff
Tim
e In
ves
tmen
t
Absolute None
Safety
86
HD
Win 98
Boot Disk
HD
Win 98
Boot Disk
HD
Win 98
Boot Disk
HD
Win 98
Boot Disk
My
Important
Data
Regular Backups are More
Important than any Virus
Protection Procedures
87
Use Software Only From
Reputable Sources...
• Don’t use pirated software.
• Don’t borrow software.
• Don’t loan software.
• Make sure you have the original software distribution disks -floppies, CD-ROM, etc.
88
Use a Virus Scanner Regularly
• Get the latest virus definitions from WWW.
• Educate users in using virus scanning
software.
• Scan diagnostic and boot disks regularly.
89
Have an Emergency
Virus Scanner Disk
Bootable Virus
Scanner
Emergency
Disk
90
Have a Quarantine Machine
for Disk Testing
• Scan disks on quarantine machine.
• Load the disk contents onto
quarantine machine HDD and scan.
• Cold boot quarantine computer from
your EBD and check hard disk.
91
The Big Question
Is it Worth all the Time
and Trouble?
92
If you get a virus...
• Ignore messages saying “Do not
turn this computer off or the data
will be destroyed”.
• Cold boot from the EBD, run
scanner and clean infected files.
• Scan any recently used floppies.
93
If you get a virus...
• Did user give floppies to anyone
else?
• Re-partition, format, and reload
software if scanner can’t remove
virus.
