I noticed alot of infected files are from outlook express. I dont even use outlook express. So what's going on?

Here is saved list from HijackThis..

Thanks.

AC3Filter (remove only)
Ad-Aware SE Personal
Adobe Reader 7.0.8
Adobe Reader Chinese Traditional Fonts
Advanced JPEG Compressor 4.8
Alive Video Converter (version 1.9.8.6)
ATI - Software Uninstall Utility
ATI Control Panel
ATI Display Driver
ATI HydraVision
AVG Free Edition
BitComet 0.56
Browser Hijack Blaster v1.0
Canon CanoScan Toolbox 4.8
Citrix Web Client
CleanUp!
CT01_Trial_Master_Files
Dell Digital Jukebox Driver
Dell ResourceCD
Diablo II
Easy CD Creator 5 Basic
ewido anti-spyware 4.0
Half-Life: Counter-Strike
HijackThis 1.99.1
Intel(R) PRO Ethernet Adapter and Software
InterActual Player
InterVideo WinDVD 4
iPhoto Plus 4
iPod Updater 2004-10-20
iTunes
J2SE Runtime Environment 5.0 Update 2
J2SE Runtime Environment 5.0 Update 4
J2SE Runtime Environment 5.0 Update 6
Java 2 Runtime Environment, SE v1.4.2_05
Java 2 Runtime Environment, SE v1.4.2_06
LiveReg (Symantec Corporation)
LiveUpdate 2.6 (Symantec Corporation)
Macromedia Flash Player 8
Manual CanoScan 8400F
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1 Hotfix (KB886903)
Microsoft Office XP Professional with FrontPage
Motorola Phone Tools
MOV to AVI MPEG WMV Converter 1.4.2
Mozilla Firefox (1.5.0.5)
MSN Music Assistant
Netscape (7.2)
OfotoNow
OLYMPUS CAMEDIA Master 2.0
OmniPage SE 2.0
Picasa 2
PowerDVD
Presto! PageManager 6.11
QuickTime
RealArcade
RealPlayer
Security Update for Windows Media Player (KB911564)
Security Update for Windows Media Player 10 (KB917734)
Security Update for Windows XP (KB883939)
Security Update for Windows XP (KB890046)
Security Update for Windows XP (KB893756)
Security Update for Windows XP (KB896358)
Security Update for Windows XP (KB896422)
Security Update for Windows XP (KB896423)
Security Update for Windows XP (KB896424)
Security Update for Windows XP (KB896428)
Security Update for Windows XP (KB896688)
Security Update for Windows XP (KB899587)
Security Update for Windows XP (KB899588)
Security Update for Windows XP (KB899591)
Security Update for Windows XP (KB900725)
Security Update for Windows XP (KB901017)
Security Update for Windows XP (KB901190)
Security Update for Windows XP (KB901214)
Security Update for Windows XP (KB902400)
Security Update for Windows XP (KB903235)
Security Update for Windows XP (KB904706)
Security Update for Windows XP (KB905414)
Security Update for Windows XP (KB905749)
Security Update for Windows XP (KB905915)
Security Update for Windows XP (KB908519)
Security Update for Windows XP (KB908531)
Security Update for Windows XP (KB911280)
Security Update for Windows XP (KB911562)
Security Update for Windows XP (KB911567)
Security Update for Windows XP (KB911927)
Security Update for Windows XP (KB912812)
Security Update for Windows XP (KB912919)
Security Update for Windows XP (KB913446)
Security Update for Windows XP (KB913580)
Security Update for Windows XP (KB914388)
Security Update for Windows XP (KB914389)
Security Update for Windows XP (KB916281)
Security Update for Windows XP (KB917159)
Security Update for Windows XP (KB917344)
Security Update for Windows XP (KB917953)
Security Update for Windows XP (KB918439)
Skype 2.5
SoundMAX
Spybot - Search & Destroy 1.4
Steam
Turbo Lister
Update for Windows XP (KB894391)
Update for Windows XP (KB896727)
Update for Windows XP (KB898461)
Update for Windows XP (KB900485)
Update for Windows XP (KB910437)
Update for Windows XP (KB916595)
Weather Pulse 2.05 build 31
WinAVI VideoConverter
Windows Driver Package - MSN (usbccgp) USB (04/19/2006 1.1.0.2)
Windows Installer 3.1 (KB893803)
Windows Installer 3.1 (KB893803)
Windows Live Messenger
Windows Live Sign-in Assistant
Windows Media Format Runtime
Windows Media Player 10
Windows XP Hotfix - KB834707
Windows XP Hotfix - KB867282
Windows XP Hotfix - KB873333
Windows XP Hotfix - KB873339
Windows XP Hotfix - KB885250
Windows XP Hotfix - KB885835
Windows XP Hotfix - KB885836
Windows XP Hotfix - KB885884
Windows XP Hotfix - KB886185
Windows XP Hotfix - KB887472
Windows XP Hotfix - KB887742
Windows XP Hotfix - KB888113
Windows XP Hotfix - KB888302
Windows XP Hotfix - KB890047
Windows XP Hotfix - KB890175
Windows XP Hotfix - KB890859
Windows XP Hotfix - KB890923
Windows XP Hotfix - KB891781
Windows XP Hotfix - KB893066
Windows XP Hotfix - KB893086
Windows XP Service Pack 2
WinRAR archiver
XviD MPEG-4 Video Codec
Yahoo! Internet Mail
Yahoo! Mail Quick Select Tool (PhotoMail)
Yahoo! Messenger
Yahoo! Photos Easy Upload Tool 1v7
ZoneAlarm