I got a old Dimension 5150 and I want to upgrade my computer and turn it to a Gaming computer. So any one out there what do you think should i or should i just buy a gaming computer. Instead of upgrade my old one. it got the space in the housing but im not to sure if its a great idea to buy all the equipment that i need to upgrade my computer and turn it to a gaming computer. Need help any one that has experiance with computers

OK HERE IS MY COMPUTER
SHOULD I MAKE THIS AS A GAMING COMPUTER OR IS IT TO OLD TO USE IT AS A GAMING COMPUTER. Sorry im not screaming.
System Summary
Service Tag:2T9X2C1 Change Service Tag
System Type:Dimension 5150/E510
Ship Date:11/10/2006
Dell IBU:Americas
QuantityParts #Part Description
1D6492Dual In-Line Memory Module 256,533,32X64,8,240,1RX16
0149DFINFO,PREP MTL,DEV,PWS,INCRS,#2
1CJ339Mouse,Universal Serial Bus 2BTN,Wheel,Lead Free,Optical Black
1DJ331Keyboard,104,Universal Serial Bus,United States,Entry Liteon,Black
1MW733Kit,Software,Overpack,WXPHSP2 Compact Diskette W/documentation,English
1JH908Kit,Speaker,Universal Serial Bus,Zylux Corporation,A225 Black,Ship In Box
1DY654Kit,Software,Works,8.5,Office TRIAL,English
1YG768Assembly,DVD+/-RW,16X,PHILIPS 05
04X388Instruction,Preparation- Material,Deviation,Dimension Increase,Number
1NJ880Processor,805,2.66,2MB,PentiumD Smithfield For Desktops,B0
1KN214DIS,FPL,19,E197FPB,BLK,FPIB
1NR694Hard Drive,80G,S2,7.2K,3.5 WD-UNIC
0XD447Service Charge,Software OWNR-MNL,Dimension, 5150/E510
0U9544Service Charge,OS,WXP,W2K Q885835
0R0920Service Charge,OS,Windows XP Windows 2000,Direct-X
0Y6981Service Charge,Software Utilities,Dimension,All Countries
0MG945Service Charge,Software,Sonic Solutions,PACT
0UD996Service Charge,Software,Intel Information File,5150/E510
0UW813Service Charge,Software DSPRT3.2,Gteck0,Dimension Inspiron
08Y305INFO,SW,ISP,AOL,PRI-OOBE
0G6911Service Charge,Software,Image Restore
0DK460Service Charge,Operating System,Windows Xp,Media Center,X64,Q917734
0UD998Service Charge,Diagnostics Intel,Lan On Motherboard 5150/E510
0KH767Service Charge,Software Internet,Search
0DY077Service Charge,Operating System,Windows Xp,Media Center,X64,Q911567
0TH655Service Kit,Software,Office, 2K3,SP2
0GR055INFO,PART,PERIPHERAL,MG
000159Information,First Boot,Hard Drive
0TC832Information,REG,REV,BCKGND, ARTIC,Silver
03K644Information,Storage Processor APIC-CONTROLLER
0PM145Service Charge,Software Microsoft Office 2003,TRIAL
0D7605INFO,NO ITEM, DIMENSION
0YF344Service Charge,Operating System,Windows 2000,Windows Xp,Media Center,X64,IE-UPD
0RG897INFO,SW,SNC,CNPLR,PACT,RLTY,1
08T284INFO,FLYER,BSD,TRANSAC
08T284INFO,FLYER,BSD,TRANSAC
0KG022Service Charge,Operating System,Windows XP,MCE Q896256
0PN545Service Charge,Software,Adobe Acrobat Reader,7.0.8 International English
0HC251Service Charge,Operating System,Windows 2000,Windows XP,Media Center,Q891781
0W7700Service Charge,Software,WMP10 Multi-media,PLUGIN
13947TLBL,BRCD,SYS BOX,GNRC,5X5
0GC443Service Charge,Operating System,Windows XP,Media CenterQ887472
1DY546SHP MTL,BX,SYSM,MTD,DIM,DAO
0CC928Service Charge,Operating System,Windows XP,Windows 2000,Q888113
0JX901Service Charge,Software,Works 8.5,English
0CH356Service Kit,Software,DLA,5.2 32Bit,64Bit
0PF038Service Charge,Operating System,Windows 2000,Windows XP,Media Center,X64,Q901214
1FC820Assembly,Heatsink,Shroud Mainstream,MSMT
001295INFO,FIRST CD ROM
0G7181Service Charge,Software,WMP,10
0W9713INFO,RLTY,DSPRT3,GTEK
1JF337KIT,CDSK,AOL9.0,BUDROM,DAO,V2
0N5710INFO,NO RAID,FIV
0FG099Service Charge,Software,NortonInternet Security,2006,90DAY English
0CH340Service Kit,Software,ROXIO Creator,LE
0UD997Service Charge,Software,Video Intel,5150/E510
0G8850Service Charge,Software Internet Service Provider AOL9.0SE
00C864INFO,BNW ENABLED,DIM
0TH100Service Charge,Operating System,Windows XP,Media CenterQ908673
1MY297LBL,FASC,INTEL,CARTON
04564UInformation,Software,Default, Fat 32
1CD016Kit,Compact Diskette,Driver Resource CD,Dimension,V2
0Y6871Service Charge,Software,PHST Low Encryption
0TX984Service Charge,Software SNAPFIRE,Server Enhanced,WorldWide
2GF145SHP MTL,CSHN,MSMT
0C7969Service Charge,Software Windows XP,DT-CLEAN-ADD
0G1059INFO,AUD-CHAN,2
0X8001Service Charge,Operating System,MSI_INSTALLER
050195Information,Software, New Technology Workstation,Version4.0,New Technology File SystemFactory Install
0MN123INFO,SW,SNAPFIRE,BNTY
123503Label,Barcode,Track,System, Generic
0R8438Service Charge,Operating System,Windows XP,Windows 2000,OEM-INFO
500009Information,Generic,Part Number
500009Information,Generic,Part Number
500009Information,Generic,Part Number
500009Information,Generic,Part Number
500009Information,Generic,Part Number
01W516INFO,PREP MTL,DEV,DT,DCRS,#6
0K1528Service Charge,Operating System,W