I suppose it's the video cards fault. Because when I move the mouse on the screen while playing the game (in particular Sid Meyer's Pirates and Guild Wars) the sound start to tremble and the speed of the mouse movements slows down.
My system information is as follows:

System
Host Name : ANTON-GI2V56W2I
User : Anton
Domain : ANTON-GI2V56W2I

Processor
Model : Intel(R) Pentium(R) 4 CPU 3.00GHz
Speed : 3.01GHz
Performance Rating : PR3999 (estimated)
SMT Support : 2 Unit(s)
Type : Standard
L2 On-board Cache : 512kB ECC Synchronous ATC (8-way sectored, 64 byte line size)

Mainboard
Bus(es) : ISA AGP PCI IMB USB FireWire/1394 i2c/SMBus
MP Support : 1 CPU(s)
MP APIC : Yes
System BIOS : American Megatrends Inc. 080009
System : To Be Filled By O.E.M. To Be Filled By O.E.M.
Mainboard : ASUSTeK Computer Inc. P4P800
Total Memory : 1023MB DDR-SDRAM

Chipset 1
Model : ASUSTeK Computer Inc 82865G/PE/P, 82848P DRAM Controller / Host-Hub Interface
Front Side Bus Speed : 4x 200MHz (800MHz data rate)
Total Memory : 1024MB DDR-SDRAM
Memory Bus Speed : 2x 200MHz (400MHz data rate)

Video System
Monitor/Panel : Default Monitor
Monitor/Panel : Default Monitor
Monitor/Panel : Default Monitor
Monitor/Panel : SyncMaster 170N(M)/172N(M)/173N(M) , SyncMaster Magic CX176N(M)
Adapter : NVIDIA GeForce FX 5200
Imaging Device : EPSON STYLUS CX3200

Physical Storage Devices
Removable Drive : Floppy disk drive
Hard Disk : Maxtor 6Y080L0
Hard Disk : WDC WD800BB-00FJA0
CD-ROM/DVD : _NEC DVD_RW ND-2500A (CD 40X Rd, 32X Wr) (DVD 5X Rd, 4X Wr)
CD-ROM/DVD : NERO IMAGEDRIVE2 SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)

Logical Storage Devices
1.44MB 3.5" (A:) : N/A
Hard Disk (C:) : 76.3GB (11.7GB, 15% Free) (NTFS)
CD-ROM/DVD (D:) : N/A
Hard Disk (F:) : 74.5GB (40.7GB, 55% Free) (NTFS)
CD-ROM/DVD (G:) : N/A

Peripherals
Serial/Parallel Port(s) : 2 COM / 1 LPT
USB Controller/Hub : ALi PCI to USB Open Host Controller
USB Controller/Hub : ALi PCI to USB Open Host Controller
USB Controller/Hub : ALi PCI to USB Open Host Controller
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D2
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D4
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D7
USB Controller/Hub : Intel(R) 82801EB USB2 Enhanced Host Controller - 24DD
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24DE
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Composite Device
USB Controller/Hub : USB Printing Support
FireWire/1394 Controller/Hub : VIA OHCI Compliant IEEE 1394 Host Controller
Infrared Device : IRXpress USB Infrared Adapter
Smart Card Device : ActivCard Virtual PC/SC
Keyboard : Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse : HID-compliant mouse
Human Interface : USB Human Interface Device

MultiMedia Device(s)
Device : SoundMAX Integrated Digital Audio

Printers and Faxes
Model : Microsoft Office Document Image Writer
Model : EPSON Stylus CX3200
Model : Adobe PDF

Power Management
AC Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows XP/2002 Professional (Win32 x86) 5.01.2600 (Service Pack 2)

Network Services
Adapter : 3Com Gigabit LOM (3C940)

My system is a pretty powerfull one. Enough memory and hard drive space. So i'm totally confused right now. I tried to reinstall both video card and sound card but it doesn't help. Anybody, please help. I really want my computer to function correctly again.

Thanx in advance
kzanton

if the 5200 grapics card could have come into conflict with your motherboard due to the backaward compatability of a pci to agp bridge (and their is no agp expansion slot on the motherboard IF IT IS A PCI CARD YOU ARE USING and you get a blue screen wobbly graphic display check this by moving a page from side to side if it is wavy then your graphics is not up to the job.

Check the bandwith speed compatability of your memory modules ddr
you should be using a PC3200/400mhz 2x512 dual channel.for stability dont mix speed rates.

If your m/board supports sata raid then I suggest that you upgrade your hardrive to a
ST3300831AS Seagate 300gb @72k/rpm with an 8mb cache and use one of the other hd as a backup and probably upgrade the graphics card as your system appears to be slowing down by some form of incompatability or you can try and upgrade your graphics driver.

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