I recently reformatted my hard drive cause of a nasty little virus

Once i finally got windows xp Home edition sp3 installed nothing has been working since..
i went to Dxdiag to see if it would even recognize anything, but all it shows is n/a for video card and completely blank for sound card.
I have no idea how to fix this or get things working. I do remember I had a ATI Radeon Hd 3600 series video card and no clue for sound card.
I used to be able to play good games now my screen like moves slow when i scroll up and down. plz help
Operating System
Windows XP Home Edition Service Pack 3 (build 2600)
Install Language: English (United States)
System Locale: English (United States)
Processor
3.00 gigahertz Intel Pentium 4
16 kilobyte primary memory cache
1024 kilobyte secondary memory cache
Hyper-threaded (2 total)
Drives
120.05 Gigabytes Usable Hard Drive Capacity
100.17 Gigabytes Hard Drive Free Space
SONY DVD RW DW-Q28A [CD-ROM drive]
3.5" format removeable media [Floppy drive]
HP Photosmart 7400 USB Device [Hard drive] -- drive 1
SAMSUNG SP1213N [Hard drive] (120.06 GB) -- drive 0, s/n 0735J1FW800932, rev TL100-23, SMART Status: Healthy
System Model
Intel Corporation
Main Circuit Board
Board: Intel Corporation D865GLC AAC28906-409
Serial Number: BTLC43732376
Bus Clock: 200 megahertz
BIOS: Intel Corp. BF86510A.86A.0063.P18.0406220349 06/22/2004
Memory Modules
2048 Megabytes Usable Installed Memory
Slot 'J6G1' has 512 MB
Slot 'J6G2' has 1024 MB
Slot 'J6H1' has 512 MB
Slot 'J6H2' is Empty
Display
None detected
Controllers
Standard floppy disk controller
Intel(R) 82801EB Ultra ATA Storage Controllers - 24D1
Intel(R) 82801EB Ultra ATA Storage Controllers - 24DB
Primary IDE Channel [Controller] (2x)
Secondary IDE Channel [Controller] (2x)