I am afraid to update my iatkos to 10.6.4 :(

[ibrahim52]

i am facing an issue of updating the existing iatkos s3 v2 to 10.6.4. I mean, for me the software updates are not working properly, I have almost tried for like 10+ times but it crashes always. After i make the software update everything installs normally but after the reboot,sometime i have kernel mismatch error or panic error. But it never boots again, this has started only since 10.6.4 released. I am attaching my hardware info generated by CPU-Z program. I am totally newbie to Apple OSx and i was wondering, if my iatkos fails to install the latest upgrades from apple ,is there any way that instead of erasing the partition again and installing the fresh OS ,i could just use the backup and restore which could make the process faster as i have gone through a tough time installing this iatkosv7 again and again.I mean just like windows xp boot repair or system restore kind of. By the way i had chose only one necessary kernel while installing the osx.Thank you.

My Hardware Configuration :
Lenovo g550 model
Dual Core pentium processor, T4400 2.20Ghz
3GB RAM
Graphics intel 4 series express chipset family
Chipset Intel GL40
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T

(sorry for my bad grammar)