Windows 7 installing - missing driver

Hi,
I received a computer from my father. It had windows xp media center but it was a COMPLETE mess! Bought Win 7 CD, formatted the drive, and now I cannot install windows 7! I keep getting the "missing driver" message and Windows cannot get installed:
Allied (on hard drive itself): Model: AL-C350ATX
PO # 249149
Below it: VCO Avertv PVR 150 PLUS TV TUNER
800724
PO # 249360-30
S/N 01744 5100

MDO Conexant CA58 Modem (fax modem?)
PO 246761-3000

DVD/CD Rewritable Drive Unit SONY
Model No. DW-Q120A
Serial # 1068642
DW-Q120A-B2
Manuf. Date: Feb 2006
OPO 16X DVD RW Black Dual Layer
PO # 249475660
(on a sticker on the very bottom of the inside of the computer)
Config ID 106235410 #1705
989035 - Systemax Vitality DH920 BTO PC
(1) System Support Kit
(1) Black Glossy vATX Base with D945GPM Motherboard
(1) Microsoft Windows XP Media Center 2005
(1) Intel Pentium D Processor 930 3.0 GHZ Dual core
(1) 1 GB PC4200 533MHS DDR2 Memory
(1) Serial ATA (SATA) Hard Drive 250gb (7200RPM)
(1) Avermedia AverTV PVR 150 Plus PCI TV Tuner
(1) 16x Dual Layer DVD +/- R/RW Drive
(1) 9-in-1 USB Card Reader



Here is what I have tried so far:
1) Burnt ISO on a DVD; made sure BIOS said to boot from CD ROM (used nero 9)
2) Burnt ISO on a DVD; made sure BIOS said to boot from CD ROM (used a program called 'Free ISO Burner' and burned it at 6x)
3) Tried to use the Microsoft ISO Burner to USB flash but the following error came up:
"The selected file is not a valid ISO file. Please select a valid ISO file and try again."
(got file at: http://www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool
4) Then, burnt ISO onto USB drive; made sure BIOS said to start with USB flash drive (just unzipped ISO and put these files on the USB drive)
5) Bought an external CD ROM Driver at BEST BUY - booted from this and still did not work
6) Installed CD-ROM updated driver
I have already worked on this for 15+ hours and cannot solve the problem. Any assistance would be appreciated!