Hello Mahesh,
I found solution for issue having with osx(partition) drive not showing up from windows 7 (read my last post above given with pics) & i successfully installed lion on my dell xps 17...
But still problems continues to arise, facing below ones..
After Installation system goes to restart, booting into windows 7 did follow steps:
I deleted all graphics kext from System/Library/Extensions as mentioned in thread >>
InteL GMA 950, X3100, HD,Geforce, ATI, NVDA. all of them &
keeping 4 HD3000 & AppleIntelIntegratedFramebuffer.kext , AppleIntelSNBVA.bundle in S/L/E
Moved AppleIntelSNBGraphicsFB.kext to other secure location for later on use.
Deleted kernelcache in S/L/C ...
Deleted
Nullcpupowermanagement.kext, AppleIntelCPUPowerManagement.kext, AppleIntelCPUPowerManagementClient.kext, AppleHDA.kext, IOAudioFamily.kext as mentioned.
Copied DSDT.aml & SSDT.aml to root of lion (core i7 2670QM made)
Replaced org.chameleon.Boot.plist & smbios.plist files in Extra folder of lion with given in thread (i m in windows 7 till here)
Restart & boot into Lion using USB iAtkos L2 (only way i can) , all goes fine
Nice apple logo & lion comes up, finished all setup process(name, account etc etc..)
Now Default Screen is 1024*768 , no sound , keyboard works but no apple key(win key),
Using kext utility i have installed AppleHDA.kext, AppleIntelCPUPowerManagement.kext, AppleIntelCPUPowerManagementClient.kext, Dell_XPS_ALC665.kext, IntelThermal.kext, IOAudioFamily.kext (given here in post)
& finally AppleIntelSNBGraphicsFB.kext for graphics, kext utility building new kernelcache!
Installed Chameleon-2.1svn-r1929.pkg to lion & Replaced org.chameleon.Boot.plist & smbios.plist with old ones.
Now comes problem, even after installing boot loader to lion i cant boot to lion straight away, have to use usb iatkos l2 to boot into it..
Its booting fine with that , now i m having full resolution of 1600*900*32 with sound but still keyboard with no apple key(win key not working as cmd key)
Installed Chameleon-2.1svn-r1929.pkg to lion.
Getting graphics glitches, artifacts & then mouse hangs with color circle spins ....(all was working fine when i was having 1024*768 with no AppleIntelSNBGraphicsFB.kext in S/L/E i guess.. )
After power off & restart i am no longer able to boot into lion directly, have to use usb iatkos l2 for it (tried chain0 trick with bcdedit

or maybe i used it in wrong way, coz i was getting chain booting error)
selecting my lion partion to boot i am getting real error as follow:
Header read size 200
Incorrect image signature
tried to look up for solution for this in other forums but no luck..
PlZZZZ ANY ONE HAVING ANY IDEA FOR THIS ????
I M WAITING FOR U GUYS COMMENTS ON THIS WITH SOLUTION...
Thanks all for reading

Neel