I have the same problem, I have been in search of a remedy and have done everything suggested and everything I know how to do and even stuff I dont know.... I have no sound!! I have the yellow question mark and exclamation mark by the multimedia audio controller, I right click on it and update drivers on all my sound video controllers but it wont update ANYTHING . says it can't be done. Also when browsing pages on myspace if the pages have any kind of plug in required or a audio player, it freezes fire fox and does not respond. AND I have even gotten the blue screen of death and some grey screen with a bunch of technical jargon on it....to boot my system is much slower than normal... I ran spyware blaster, avg, windows defender, they all say nothing is wrong, I have done the system maintenance... WHAT CAN I DO??? WHAT DO I DO??? PLEASE OH PLEASE HELP ME!!

I did the bellarc thing and here are the findings....
Operating System System Model
Windows XP Home Edition Service Pack 3 (build 2600) Dell Computer Corporation Dimension 4550
System Service Tag: 9MTS121 (support for this PC)
Chassis Serial Number: 9MTS121
Enclosure Type: Mini-Tower
Processor a Main Circuit Board b
2.00 gigahertz Intel Pentium 4
8 kilobyte primary memory cache
512 kilobyte secondary memory cache Board: Dell Computer Corp.
Bus Clock: 400 megahertz
BIOS: Dell Computer Corporation A02 10/02/2002
Drives Memory Modules c,d
59.99 Gigabytes Usable Hard Drive Capacity
12.63 Gigabytes Hard Drive Free Space
_NEC CD-RW NR-9100A [CD-ROM drive]
SAMSUNG CD-ROM SC-148C
VW5163N JQC705X SCSI CdRom Device [CD-ROM drive]
3.5" format removeable media [Floppy drive]
WDC WD600BB-75CAA0 [Hard drive] (60.00 GB) -- drive 0, s/n WD-WMA8F1505444, rev 16.06V16, SMART Status: Healthy 512 Megabytes Installed Memory
Slot 'DIMM_A' has 256 MB
Slot 'DIMM_B' has 256 MB
Local Drive Volumes
c: (NTFS on drive 0) 59.99 GB 12.63 GB free
Network Drives
None detected
Users (mouse over user name for details) Printers
local user accounts last logon
One 5/22/2008 6:35:20 PM (admin)
local system accounts
Administrator never (admin)
ASPNET never
Guest never
HelpAssistant never
SUPPORT_388945a0 never
DISABLED Marks a disabled account; LOCKED OUT Marks a locked account
hp psc 1310 series on USB001
Lexmark 1200 Series on USB002
Lexmark Print-2-Fax Printer on LexmarkFax
Controllers Display
Standard floppy disk controller
Intel(R) 82801DB Ultra ATA Storage Controller - 24CB
Primary IDE Channel [Controller]
Secondary IDE Channel [Controller] NVIDIA GeForce4 MX 420 [Display adapter]
DELL E772c [Monitor] (15.7"vis, s/n 6418029600U9, September 2002)
Bus Adapters Multimedia
SCSI/RAID Host Controller
Intel(R) 82801DB/DBM USB 2.0 Enhanced Host Controller - 24CD
Intel(R) 82801DB/DBM USB Universal Host Controller - 24C2
Intel(R) 82801DB/DBM USB Universal Host Controller - 24C4
Intel(R) 82801DB/DBM USB Universal Host Controller - 24C7 Unimodem Half-Duplex Audio Device
Communications Other Devices
BCM V.92 56K Voicemodem
Intel(R) PRO/100 VE Network Connection
primary Auto IP Address: 192.168.254.1 / 24
Gateway: 192.168.254.254
Dhcp Server: 192.168.254.254
Physical Address: 00:07:E9:B2:8D:06
Networking Dns Server: 192.168.254.254
Lexmark 1200 Series
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
PS/2 Compatible Mouse
Generic USB Hub
USB Printing Support
USB Root Hub (4x)
Virus Protection [Back to Top]
AVG 7.5.524 Version 7.5.524
Realtime File Scanning On
Missing Microsoft Security Hotfixes [Back to Top]
All required security hotfixes (using the 05/13/2008 Microsoft Security Bulletin Summary) have been installed.