WinXP Low on memory

I have a few questions about cleaning my computer. First, What would happen if I deleted all the things on add/remove programs? Second, What would happen if I deleted all my program files (Not system files)?

Also, what can be removed from here to clean up some space?
ABBYY FineReader 6.0 Sprint
Adobe Flash Player 10 ActiveX
Adobe Flash Player 10 Plugin
Adobe Shockwave Player 11.5
AMD Processor Driver
ATI - Software Uninstall Utility
ATI Catalyst Control Center
ATI Display Driver
AutoHotkey 1.0.48.05
Avira AntiVir Personal - Free Antivirus
Broadcom NetXtreme Ethernet Controller
Catalyst Control Center - Branding
Catalyst Control Center - Branding
CCleaner
Counter-Strike: Source
HijackThis 2.0.2
Hotfix for Microsoft .NET Framework 3.5 SP1 (KB953595)
Hotfix for Microsoft .NET Framework 3.5 SP1 (KB958484)
Hotfix for Windows XP (KB952287)
Hotfix for Windows XP (KB961118)
Hotfix for Windows XP (KB970653-v3)
Hotfix for Windows XP (KB976098-v2)
HydraVision
HyperCam 2
Java DB 10.4.2.1
Java(TM) 6 Update 17
Java(TM) SE Development Kit 6 Update 17
Lexmark X5400 Series
Malwarebytes' Anti-Malware
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1 Security Update (KB953297)
Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 3.0 Service Pack 2
Microsoft .NET Framework 3.5 SP1
Microsoft .NET Framework 3.5 SP1
Microsoft .NET Framework 4 Client Profile Beta 1
Microsoft .NET Framework 4 Client Profile Beta 1
Microsoft .NET Framework 4 Extended Beta 1
Microsoft .NET Framework 4 Extended Beta 1
Microsoft Kernel-Mode Driver Framework Feature Pack 1.7
Microsoft Visual C++ 2005 Redistributable
Microsoft Visual C++ 2008 ATL Update kb973924 - x86 9.0.30729.4148
Microsoft Visual C++ 2008 Redistributable - x86 9.0.30729.17
Microsoft Visual C++ 2010 Beta 1 x86 Redistributable - 10.0.20506
Mozilla Firefox (3.5.6)
PC Tools Firewall Plus 6.0
PunkBuster Services
Realtek AC'97 Audio
Security Update for Windows Internet Explorer 8 (KB971961)
Security Update for Windows Internet Explorer 8 (KB974455)
Security Update for Windows Internet Explorer 8 (KB976325)
Security Update for Windows Media Player (KB952069)
Security Update for Windows Media Player (KB954155)
Security Update for Windows Media Player (KB968816)
Security Update for Windows Media Player (KB973540)
Security Update for Windows XP (KB923561)
Security Update for Windows XP (KB923789)
Security Update for Windows XP (KB946648)
Security Update for Windows XP (KB950762)
Security Update for Windows XP (KB950974)
Security Update for Windows XP (KB951066)
Security Update for Windows XP (KB951376-v2)
Security Update for Windows XP (KB951748)
Security Update for Windows XP (KB952004)
Security Update for Windows XP (KB952954)
Security Update for Windows XP (KB953155)
Security Update for Windows XP (KB954459)
Security Update for Windows XP (KB955069)
Security Update for Windows XP (KB956572)
Security Update for Windows XP (KB956744)
Security Update for Windows XP (KB956802)
Security Update for Windows XP (KB956803)
Security Update for Windows XP (KB956844)
Security Update for Windows XP (KB957097)
Security Update for Windows XP (KB958644)
Security Update for Windows XP (KB958687)
Security Update for Windows XP (KB958869)
Security Update for Windows XP (KB959426)
Security Update for Windows XP (KB960225)
Security Update for Windows XP (KB960803)
Security Update for Windows XP (KB960859)
Security Update for Windows XP (KB961371-v2)
Security Update for Windows XP (KB961501)
Security Update for Windows XP (KB968537)
Security Update for Windows XP (KB969059)
Security Update for Windows XP (KB969947)
Security Update for Windows XP (KB970238)
Security Update for Windows XP (KB970430)
Security Update for Windows XP (KB970483)
Security Update for Windows XP (KB971486)
Security Update for Windows XP (KB971557)
Security Update for Windows XP (KB971633)
Security Update for Windows XP (KB971657)
Security Update for Windows XP (KB971961)
Security Update for Windows XP (KB973354)
Security Update for Windows XP (KB973507)
Security Update for Windows XP (KB973525)
Security Update for Windows XP (KB973869)
Security Update for Windows XP (KB973904)
Security Update for Windows XP (KB974112)
Security Update for Windows XP (KB974318)
Security Update for Windows XP (KB974392)
Security Update for Windows XP (KB974455)
Security Update for Windows XP (KB974571)
Security Update for Windows XP (KB975025)
Security Update for Windows XP (KB975467)
Steam
Update for Microsoft .NET Framework 3.5 SP1 (KB963707)
Update for Windows Internet Explorer 8 (KB975364)
Update for Windows Internet Explorer 8 (KB976749)
Update for Windows XP (KB898461)
Update for Windows XP (KB951978)
Update for Windows XP (KB961503)
Update for Windows XP (KB967715)
Update for Windows XP (KB968389)
Update for Windows XP (KB971737)
Update for Windows XP (KB973687)
Update for Windows XP (KB973815)
Windows Internet Explorer 8
WinRAR archiver

First, What would happen if I deleted all the things on add/remove programs?

You can easy reinstall Windows and all your Programs are gone.

Second, What would happen if I deleted all my program files (Not system files)?

You'll lost all your programs on that hard drive you deleted.

All programs are just fine