Desktop Effects Could not be enabled in Mercury PVM7 MB

give me your VGA model

open terminal and write this

lspci | grep VGA

ramesh@RameshArun:~$ lspci | grep VGA
01:00.0 VGA compatible controller: VIA Technologies, Inc. CN700/P4M800 Pro/P4M800 CE/VN800 [S3 UniChrome Pro] (rev 01)
ramesh@RameshArun:~$

Whenever I open compiz my screen struggles a lot... Tell me any way to bring up the desktop effects....

Here you can find a checking script:
http://forlong.blogage.de/entries/pages/Compiz-Check

"Compiz-Check is a script to test if Compiz is able to run on your system/setup and if not, it will tell you the reason why."

And here
http://www.youtube.com/watch?v=1dYy_yhoYS0
is some video deskription of it and how to cheat a blacklist of Compiz, if you thing it will solve your problem.

And here ;-)
http://www.youtube.com/watch?v=sNul-ZJPK9s&feature=related
you can watch a very sad man having a similar problem.

The output of the script is ,

ramesh@RameshArun:~$ ./compiz-check

Gathering information about your system...

 Distribution: Ubuntu 8.10
 Desktop environment: GNOME
 Graphics chip: VIA Technologies, Inc. CN700/P4M800 Pro/P4M800 CE/VN800 [S3 UniChrome Pro] (rev 01)
 Driver in use: openchrome
 Rendering method: AIGLX

Checking if it's possible to run Compiz on your system... [SKIP]

 Checking for hardware/setup problems... [SKIP]

At least one check had to be skipped:
 Error: openchrome driver in use

ramesh@RameshArun:~$

Did you install Compiz Fusion?
Do you have a graphics card?
     -- If you do have one do you have the correct drivers (including restricted) for it to work?

Seems that compiz with openchrome driver is a no go.
http://forum.compiz-fusion.org/showthread.php?s=42a5e1e67f998adb2c5b5baa5578a401&t=6878

https://help.ubuntu.com/community/RecommendedHardware

I installed CompiZ Fusion and I dont have graphics card.My Graphics memoru is 64MB....

I have graphic card 00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 03)
I also have a 3D blaster banshee video card model #CT 6760 which I am going to install.
hpowner@ubuntu:~$ wget http://blogage.de/files/9124/download -O compiz-check
--2009-06-07 08:06:53-- http://blogage.de/files/9124/download
Resolving blogage.de... 78.46.34.206
Connecting to blogage.de|78.46.34.206|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/octet-stream]
Saving to: `compiz-check'
    [ <=> ] 28,360 18.3K/s in 1.5s

2009-06-07 08:06:56 (18.3 KB/s) - `compiz-check' saved [28360]

when i execute in terminal nothing happens.

David,
the command supposed for compiz-check from your Desktop is

./compiz-check

Don't forget this
./
please.

Still i was not able to enable desktop effects.Please help...