Cant install intel graphic driver

I'm using windows xp and Intel® 82945G Express Chipset Family.

My pc was working fine than I checked for driver update and found one update and downloaded it from intel's official website.

Than I tried to install that driver but it says something is missing (Can't remember what) and it was asking to locate the file.

Until i could search on net about this issue, setup crashed and pc got rebooted.

Than it says display driver not available.

I tried again to install driver and it started saying "Can't continue due to some error".

I downloaded zip file and tried to install from that setup and still got same error.

Than i tried installing manually

1. Start

2. Right Click on My Computer

3. Manage

4. Device Manager

5. Open Display Driver and Right click Intel® 82945G Express Chipset Family

6. Update Driver

7. Select "Install from a list or specific location (Advance)

8. Don't search. I will choose the driver to install

9. Select display driver from the list

10. Select "Have Disk"

11. Browse for file

12. Next

It starts to copy new file and than it shows cannot install driver and says access is denied.

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