hi every one i just have installed windows 7 the beta version
on my windows xp pro

well i have some problems with it cuase my pc is what older
well i have orderd the problems here so if soemone can help me out with this that would be great

1.after i installed windows 7 i my divece centr i have got 2 devicec that the drivers cant be found
- video controller and pci simple communications controller
i have found the driver for the pci simple communications controller but the other video controllet i didint find it on the net i have a ati radeon 9250 its a older version so i dont know if there is a solution for that but if there is please let me know

2. second problem is after i dont know a virus or something was getting in to my computer every time i WANT to launch google chrome it says
a eroor with some kinf of code like (0x0000005)
i really have no idea why i have started google chrome before and was working fine but now it cant.

3. well this problem has been going on after a virus was detect everytime i start up my pc the pc gets a blackscreen before the desktop launch
i have tried to get in with the taskmanger and then run explorer.exe
it worked well but after that i was ALSO going into regedit to solve the problem with winlogon/shell/explorer.exe
i had changed explorer.exe to Explorer.exe and after that iw roked really good after restartin the pc there where no problemes but after i installed ESET smart security i was getiing al these warnings of viruses i think there where 121 virus detected by eset and he ofcourse deleted them but after that i had to restart my pc and again the same problme with the black screen but this time even if a click run on the taskmanager with explorer.exe IM getting noting

i really dont know if tis is a virus that al doing that or is ti windows 7 i really dont know but if soemone can help me out that would be great

im sorry for the spelling i was typing so fast that i didnt pay atention to the spelling

if i hope this problems are cleared what kinf of internet security or antivirus can i use what kind of virusscanner is good and works with windows 7
i dont have a budget so be my quest

again please if soemone can help me out

thanks