After fresh reinstall of XP, sound is not working and display is chunky/flickering.

I just took a friend's computer and am trying to fix it up for him.  I don't know where it came from, where it was bought or basically what's inside it.  It's an older computer but it's good for his purposes.  The first thing I did was re-format and install a fresh new Windows XP SP2 Professional.  After I finished installing, the sound is no longer working.  When I go to Control Panel > Sounds and Audio Devices > it says 'No Audio Device'.  My speakers are working, I verified with an MP3 player.  
On top of that, I noticed that display is incredibly choppy and slow when I scroll web pages, move windows around, minimize or maximize windows.  I think it's due to an incorrect video driver.  I'm not too sure what's wrong but upon a bit of research, I've seen a lot of people suggest that I run BelArc profiler and post the generated profile, so here it is:  

Operating System               System Model
Windows XP Professional Service Pack 2 (build 2600)               ASUSTeK Computer Inc. K8V-MX
Enclosure Type: Mini-Tower
Processor a               Main Circuit Board b
1.60 gigahertz AMD Sempron
64 kilobyte primary memory cache
128 kilobyte secondary memory cache               Board: ASUSTeK Computer Inc. K8V-MX Rev 1.XX
Bus Clock: 200 megahertz
BIOS: American Megatrends Inc. 1009.005 09/20/2005
Drives               Memory Modules c,d
164.27 Gigabytes Usable Hard Drive Capacity
79.17 Gigabytes Hard Drive Free Space

BENQ CDRW 5232X [CD-ROM drive]
PIONEER DVD-ROM DVD-114 [CD-ROM drive]

HDS728080PLAT20 [Hard drive] (82.35 GB) -- drive 0, s/n PFD242SEUHEZDB, rev PF2OA21B, SMART Status: Healthy
Maxtor 5000LE v01.00.00 USB Device [Hard drive] (81.96 GB) -- drive 1               448 Megabytes Installed Memory

Slot 'DIMM0' is Empty
Slot 'DIMM1' has 512 MB
        Local Drive Volumes
        
            
c: (NTFS on drive 0)       82.34 GB       78.82 GB free
f: (FAT32 on drive 1)       81.94 GB       357 MB free
        Network Drives
        None detected
Users (mouse over user name for details)               Printers
local user accounts      last logon
 Jimmy       10/7/2007 7:44:54 PM       (admin)
local system accounts
 Administrator       never       (admin)
 Guest       never       
 HelpAssistant       never       
 SUPPORT_388945a0       never       

DISABLED Marks a disabled account;   LOCKED OUT Marks a locked account
              
Microsoft Office Document Image Writer Driver       on Microsoft Document Imaging Writer Port:
Controllers               Display
Standard floppy disk controller
Primary IDE Channel [Controller] (2x)
Secondary IDE Channel [Controller] (2x)
Standard Dual Channel PCI IDE Controller
VIA Bus Master IDE Controller               None detected
Bus Adapters               Multimedia
VIA Rev 5 or later USB Universal Host Controller (4x)
VIA USB Enhanced Host Controller               None detected
Communications               Other Devices
            
1394 Net Adapter
D-Link AirPlus G DWL-G122 Wireless USB Adapter(rev.C)
 primary        Auto IP Address:       192.168.0.102 / 24
      Gateway:       192.168.0.1
      Dhcp Server:       192.168.0.1
      Physical Address:       00:19:5B:7A:8F:92
VIA Compatable Fast Ethernet Adapter
      Dhcp Server:       none responded
      Physical Address:       00:13:D4:E4:6D:B1
 
Networking Dns Server:       192.168.0.1
              VIA OHCI Compliant IEEE 1394 Host Controller
USB Human Interface Device
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
HID-compliant mouse
USB Mass Storage Device
USB Root Hub (5x)

Thanks in advance for any help you guys can provide.