Flash Player doesn't play smoothly and out of sync in full screen

Question

Hello! Everyone
The flash player (11.2.202.235) does not play smoothly and in full screen audio and vidoe is out of sync.  I didn't use to have any problem at all, it only started about two weeks ago and since then despite trying various things (i.e. disabling hardware excelration, uninstalling & reinstalling, trying various browsers etc.) has not resolved the issue.  I don't know why it has suddenly stopped playing smoothly as I have not installed any software recently which might have cuased this. 
I am using Windows XP (service pack3) and have dual partion with dual operating system (both XP).  There is the same problem on both operarting system and flash player won't run smoothly on either of them.  Although my computer and graphics card is quite old but the downloaded movies/DVD playback is fine even in full screen.  It runs smoothly and audio&video is in sync so I don't think it could my the graphics card. 
As I mentioned I have tried all the browsers but without any luck.  The BBC iplayer plays ok most of the time if not in full screen but as soon as you make it full screen the vidoe is more like a slide show and very jittery and audio&video gets out of sync.  Same with youtube vidoes, they play ok when not in full screen but the video in full screen does not play smoothly and audio&vidoes gets out of sync.  However the ITV player & Channel 4 content on 4OD does not even play smoothly when not in full screen and the video&audio is out of sync all the time. 
It would be really helpful if anyone can suggest anything to resolve this issue as I have not been able to find anything on the internet to solve the problem and its driving me up the wall.  Although I have tried to include as much details as I could think of so please let me know if I have missed any details that could be crucial in order to identify the problem.
Thank you very much for reading this and taking the time to reply and your feedback. 
Below is the DxDiag report for my laptop:
Time of this report: 4/22/2012, 00:15:58      
Machine name: TIMES-LAPTOP   
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.111025-1629)           
Language: English (Regional Setting: English)
System Manufacturer: TimeComputers       
System Model: VT8372               
BIOS: Insyde Software MobilePRO BIOS Version 4.00.01          
Processor: mobile AMD Athlon(tm) XP 2000+,  MMX,  3DNow, ~1.7GHz             
Memory: 1248MB RAM          
Page File: 809MB used, 2790MB available        
Windows Dir: C:\WINDOWS    
DirectX Version: DirectX 9.0c (4.09.0000.0904) DX
Setup Parameters: Not found     
DxDiag Version: 5.03.2600.5512 32bit Unicode 
------------ DxDiag Notes ------------  
DirectX Files Tab: No problems found.      
Display Tab 1: No problems found.        
Sound Tab 1: No problems found.          
Music Tab: No problems found.          
Input Tab: No problems found.        
Network Tab: No problems found. 
-------------------- DirectX Debug Levels --------------------
Direct3D:    0/4 (n/a)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail) 
--------------- Display Devices ---------------        
Card name: S3 Graphics ProSavageDDR               
Manufacturer: S3 Graphics Co., Ltd.        
Chip type: S3 ProSavage DDR         
DAC type: S3 SDAC       
Device Key: Enum\PCI\VEN_5333&DEV_8D04&SUBSYS_83751071&REV_00   
Display Memory: 32.0 MB     
Current Mode: 1024 x 768 (32 bit) (60Hz)          
Monitor: Digital Flat Panel (1024x768)   Monitor Max Res:       
Driver Name: s3gnb.dll   
Driver Version: 6.14.0010.0025 (English)      
DDI Version: 9 (or higher)
Driver Attributes: Final Retail 
Driver Date/Size: 3/2/2004 14:02:26, 402048 bytes      
WHQL Logo'd: Yes   WHQL Date Stamp: n/a              
VDD: n/a         
Mini VDD: s3gnbm.sys    
Mini VDD Date: 3/2/2004 14:02:30, 167040 bytes
Device Identifier: {D7B75DD3-CE44-11CF-D873-7FA3A1C2CB35}        
Vendor ID: 0x5333        
Device ID: 0x8D04        
SubSys ID: 0x83751071      
Revision ID: 0x0000      
Revision ID: 0x0000      
Video Accel: ModeMPEG2_C ModeMPEG2_A ModeMPEG2_D  
Deinterlace Caps: n/a         
Registry: OK     
DDraw Status: Enabled       
D3D Status: Enabled       
AGP Status: Enabled DDraw
Test Result: Not run 
D3D7 Test Result: Not run 
D3D8 Test Result: Not run 
D3D9 Test Result: Not run 
------------- Sound Devices -------------            
Description: Vinyl AC'97 Audio (WAVE) 
Default Sound Playback: Yes 
Default Voice Playback: Yes            
Hardware ID: PCI\VEN_1106&DEV_3059&SUBSYS_83751071&REV_50        
Manufacturer ID: 1             
Product ID: 100                   
Type: WDM            
Driver Name: vinyl97.sys         
Driver Version: 6.14.0001.4170 (English)      
Driver Attributes: Final Retail            
WHQL Logo'd: Yes          
Date and Size: 8/10/2006 07:32:14, 204672 bytes            
Other Files:         
Driver Provider: VIA Technologies, Inc.         
HW Accel Level: Full              
Cap Flags: 0xF5F    
Min/Max Sample Rate: 8000, 48000 Static/Strm
HW Mix Bufs: 1, 0  Static/Strm
HW 3D Bufs: 0, 0              
HW Memory: 0       
Voice Management: No  EAX(tm) 2.0
Listen/Src: No, No    I3DL2(tm)
Listen/Src: No, No Sensaura(tm)
ZoomFX(tm): No               
Registry: OK      
Sound Test Result: Not run 
--------------------- Sound Capture Devices ---------------------            
Description: Vinyl AC'97 Audio (WAVE)  
Default Sound Capture: Yes  
Default Voice Capture: Yes            
Driver Name: vinyl97.sys         
Driver Version: 6.14.0001.4170 (English)      
Driver Attributes: Final Retail          
Date and Size: 8/10/2006 07:32:14, 204672 bytes              
Cap Flags: 0x41           
Format Flags: 0xFFF 
----------- DirectMusic -----------        
DLS Path: C:\WINDOWS\SYSTEM32\drivers\GM.DLS     
DLS Version: 1.00.0016.0002    
Acceleration: n/a           
Ports: Microsoft Synthesizer, Software (Not Kernel Mode), Output, DLS, Internal, Default Port                  
Vinyl AC'97 Audio (WAVE), Software (Kernel Mode), Output, DLS, Internal                  
Microsoft MIDI Mapper [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal                  
Microsoft GS Wavetable SW Synth [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal        
Registry: OK     
Test Result: Not run 
------------------- DirectInput Devices -------------------      
Device Name: Mouse         
Attached: 1    
Controller ID: n/a
Vendor/Product ID: n/a        
FF Driver: n/a       
Device Name: Keyboard         
Attached: 1    
Controller ID: n/a
Vendor/Product ID: n/a        
FF Driver: n/a 
Poll w/ Interrupt: No         
Registry: OK 
----------- USB Devices -----------
+ USB Root Hub |
Vendor/Product ID: 0x1106, 0x3038 |
Matching Device ID: usb\root_hub |
Service: usbhub |
Driver: usbhub.sys, 4/13/2008 19:45:37, 59520 bytes |
Driver: usbd.sys, 8/23/2001 13:00:00, 4736 bytes

Answer 1

Would you mind opening a new bug on this at bugbase.adobe.com?  Please include your dxdiag report, a specific URL and a link to this forum thread.
In the meantime, you might want to try our 11.3 beta or rollback to a previous version of the player to see if that resolves the problem.
Thanks,
Chris