Not updating VistaSP2 - Error 0*80070490

I have Vista Home Premium SP1 installed on my Dell machine purchased in May 2008. Windows update stopped working sometime in 2009 and after trying to sort out things for two weeks with microsoft support, I gave up. My system had no updates for about last 2 yrs now.

After a gap of 2 yrs, now I am again trying to update my windows. For last 3 days, I am trying to update manually SP2 from windows download site, but I got the error 0*80070490. I ran system update readiness tool (Windows6.0-KB947821-v4-x86) but
it did not work.

Only suggested solution now is to repair the windows which is not possible for me as my original CD is broken.

Following is the log report after running system update readiness tool. Any help is much appreciated.


=================================
Checking System Update Readiness.
Binary Version 6.0.6001.22375
Package Version 5.0
2011-08-21 21:00

Checking Deployment Packages

Checking Package Manifests and catalogs.

Checking package watchlist.

Checking component watchlist.

Checking packages.
(f) CBS Registry Error 0x80070103 Package_for_KB947864_client_0~31bf3856ad364e35~x86~~6.0.1.0 failed to get owner for package.
(f) CBS Registry Error 0x80070103 Package_for_KB947864_client_1~31bf3856ad364e35~x86~~6.0.1.0 failed to get owner for package.
(f) CBS Registry Error 0x80070002 WUClient-SelfUpdate-Core-CoreComp~31bf3856ad364e35~x86~~7.0.6000.381 failed to get Visibility

Checking component store
(f) CSI Payload File Missing 0x00000000 dxg.sys x86_microsoft-windows-dxg_31bf3856ad364e35_6.0.6001.18000_none_a8eb419e5b1d08cd
Summary:
Seconds executed: 1675
Found 4 errors
CSI Payload File Missing Total Count: 1
CBS Registry Error Total Count: 3

To install windows sp2 the system would need some prerequisite updates, which would serve as a base for the SP2 to be installed on the system. I would recommend to install all the windows updates first and then let the SP2 come through windows update itself and then check. In case you face any issues while installing / downloading windows updates then let us know.