[audio faster than video when i watch videos online]

I have an old computer that I have basically built from parts of a number of other computers. Until a few months ago I haven't had any problems with it, then all of the sudden when I started watching videos online (no matter what website I'm on) the audio started being roughly 2 to 3 seconds faster than the video. Videos saved to my harddrive or from DVD's play fine through my media player. I have unistalled and re-installed the drivers and even uninstalled and re-installed adobe flash player. I've gone online to different forums and tried different suggestions about changing settings and nothing seems to work. I was just wondering if anyone has had this same problem and has any suggestions on how to fix this. I have put the system and display specs below.

[system Summary]

Item Value

OS Name Microsoft Windows XP Home Edition

Version 5.1.2600 Service Pack 3 Build 2600

OS Manufacturer Microsoft Corporation

System Name MITCH

System Manufacturer Dell Computer Corporation

System Model Dimension 2350

System Type X86-based PC

Processor x86 Family 15 Model 1 Stepping 3 GenuineIntel ~1794 Mhz

BIOS Version/Date Mitac International A02, 3/24/2003

SMBIOS Version 2.3

Windows Directory C:\WINDOWS

System Directory C:\WINDOWS\system32

Boot Device \Device\HarddiskVolume1

Locale United States

Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"

User Name MITCH\Owner

Time Zone Eastern Daylight Time

Total Physical Memory 768.00 MB

Available Physical Memory 323.51 MB

Total Virtual Memory 2.00 GB

Available Virtual Memory 1.95 GB

Page File Space 1.83 GB

Page File C:\pagefile.sys

[Display]

Item Value

Name Intel® 82845G/GL/GE/PE/GV Graphics Controller

PNP Device ID PCI\VEN_8086&DEV_2562&SUBSYS_01471028&REV_03\3&13C0B0C5&0&10

Adapter Type Intel® 82845G Graphics Controller, Intel Corporation compatible

Adapter Description Intel® 82845G/GL/GE/PE/GV Graphics Controller

Adapter RAM 64.00 MB (67,108,864 bytes)

Installed Drivers ialmrnt5.dll

Driver Version 6.14.10.4544

INF File oem19.inf (i845G section)

Color Planes 1

Color Table Entries 4294967296

Resolution 1024 x 768 x 75 hertz

Bits/Pixel 32

Memory Address 0xE0000000-0xE7FFFFFF

Memory Address 0xEE000000-0xEE07FFFF

IRQ Channel IRQ 16

I/O Port 0x000003B0-0x000003BB

I/O Port 0x000003C0-0x000003DF

Memory Address 0xA0000-0xBFFFF

Driver c:\windows\system32\drivers\ialmnt5.sys (6.14.10.4544, 788.87 KB