Windows 7 Audio and Video Problems

I know I'm too late coz' I just recently upgraded to windows 7 from XP :)
But I'm having problems with my audio and video after installing winodws 7
I already installed latest drivers for both but my audio has some kind of static noise. It is lessen when I set it to minimum bit and hertz but i still hear a bit. As for the video, I know I only have a very poor internal video card but games really lags even Warcraft 3. I can't even change the brightness in Warcraft. I'm really curious because I don't experience both of these problems in XP PS: I now have dual boot XP with my 7 so I actually compare them....hope someone can help me. Thanks :)

I've already run the windows 7 upgrade advisor, it said my system is compatible with 32 and even 64 bit version of windows 7, my sound card and video card are listed as compatible devices. I just don't get why I get different experience with XP and windows 7 :). Anyway, thanks for the reply

I solved the audio problem. I found someone with the same problem and older version of the sound driver did the work. I don't understand, I thought installing latest drivers is the best thing to do. Anyway, I hope this method works on my video problems too. i'll try to find older version for it.

bad news, older version for my video driver isn't solving the problem LOL
maybe best choice for me is to buy a BETTER video card and power supply since I only have 250 watts or maybe buy a new CPU LOL