prob with compiz
 

Ive enabled some of the plugins in compiz but I'm not able to see the effects(like the water,blur,burn,etc)
also Ive noticed this same problem in my friend's system where we installed mandriva...

Not all effects will work on all computers.

Problem with Compriz
 

It might help if you told us what video card you were using, Mem on board, drivers, etc:twocents:

I'm having 512 Mb RAm, Intel D101GGC board....no gfx card,pentium ht 3.0 ghz(the specs might be the prob)

The specs are almost certainly the problem - eg. the "burn" in a high demand effect, not all cards will run it well. It happens - but it's rough and slow and stalls a lot.

Do you get other effects - like the desktop wall, wobbly windows, explode, true-transparency etc?

Enter lspci and look for the line which says "vga compatible controller" or similar. This is your video card. Copy that whole line out here.

Look for that card in /etc/X11/xorg.conf - copy the entire "device" section.

Some intel cards are blacklisted in some versions of compiz/fusion. Low-end cards will not work with high-demand effects you have mentioned in your first post.

well I get the desktop cube,wobbly,fade,cude unwrapping effect.noting more.That is ok
but i heared ubuntu does not support d101ggc is that true???(since I wanted to try out the studio edition)moreover one last question...How do I design themes for mandriva,I've done skins for mediaplayer and winamp in the past(now woprking on xp themes)so it would help me if u could show me the way.....

Good grief, your English suddenly crashed! It is important to make your posts easy to read. Let me give you some tips:

1. sentences start with an upper-case letter.
2. there is a whole line between paragraphs.
3. there is one idea per paragraph.
4. there is a space after most punctuation.
5. avoid l33t sp33k abbreviations like u for you.
6. the "I" is always upper case when referring to yourself.
7. when you refer to something said elsewhere, try to provide a reference in the form of a hyperlink.
8. proper names start with upper case letters.
9. acronyms are upper case.
10. don't assume that everyone automatically understands your context - eg. when you are asking about a motherboard, actually use the word "motherboard" or "mobo" and not just the product numbers. Don't force us to guess.

There's more, but ten should be sufficiently demoralizing for now ;)

So if I parse your last post - it ends up looking like this:
To actually answer your post, as I interpret it above:

1. There is nothing in the listed specs which is explicitly unsupported in Ubuntu 8.04. Can you provide a reference?

graphics = radeon X300, which is RV370 chipset - supported by the free radeon driver.
audio = Realtek* ALC861 which does have issues in linux - generally it works with the intel hda audio driver but there is no second guessing the exact setup.
lan = Realtek* 8101L - there have been issues with realtek lan cards in the past, I doubt there will be trouble with this.

Probably what you should try is running the benchmark accessory and seeing what happens to your load with different effects. You'll probably find that the videocard is not up to it indeed.

2. "Mandriva" is a gnulinux distro - it doesn't have themes. However, many of the programs that make up the distro do have themes. The method of creating them depends on the application.

Do you mean desktop themes? Is this for Gnome or KDE or XFce or what? Perhaps you want to create Compiz-Fusion window decoration themes - for Emerald? Or do you mean MPlayer themes? Something else? (Freedom means choice.)

The different projects have information about their themes - most applications are standardizing on XML these days so you often only need a pre-packaged example: unpack it, read the files. XML tends to be self documenting.

Thanks for the lesson on English...Hope I don't repeat the errors again.

Anyway here is the link for my winamp skins..
http://www.winamp.com/user/details/492689/submissions

Why do I care about winamp skins?

Oh well... while I am looking.
Winamp site terms of use:

Jurisdiction is not mentioned, and there is no legal protection for trade secrets. Not "all content" can be covered by the entire list either.

Button shapes? But... they're square! Nullsoft is trying to trademark squares?

But it's not unusual for the proprietary mindset to overdo the "protection".

The distribution license, for eg, is non transferable. You cannot give away a copy of yours to a mate without internet for eg.

Since there is so much free software available, I don't see why I should encumber myself with this rubbish.