Need drivers for sony pcg-7g1m notebook, can any one please help

check compatibility here Sony eSupport Electronics Windows 10 Information for Sony Products and Sony eSupport Windows 10 Upgrade information

I could not trace your model though.
What was the original os on it ?
Do you know the video hardware chip/card name ?

visit the official website of sony...it may help you...

Should be able to find it on the sony website... go to sony.com and support then look up your computers model and you should find the download your looking for

Why don't you ask the people who DID the change ?
By the way what do you mean by "change the disc", as far as its content is concerned, duplicate the former one, or reinstall the OS ?

http://www.diahmemory.com/sony-vaio-pcg-7g1m-notebook-ram.html
This is the specs and memory you can buy rather cheap in my humble opinion. John

All the VAIO Computers will be shipped with the Recovery partition in the Hard Drive. If the Hard Drive is not completely formatted, you can access the Recovery partition by pressing the F10 key for 5 to 10 seconds when the VAIO logo appears.

If you're able to access the Recovery partition, then select Restore C Drive option to restore the Computer back to the factory settings.
Let me inform you how to check the if Recovery partition is available.

Press windows+R key and type diskmgmt.msc and check if you're able to view EISA partition. If EISA partition is there, then the Recovery partition is available and you can access by pressing the F10 key at start-up.
If the EISA partition is not there, then the partition is deleted, then you can purchase the Recovery Discs for your Computer which may cost $15 to $35.

goto realtek web site and then download the sound driver

You can take the card out (it is under one of the covers on the bottom of the computer) and see what it is. Go to that manufacturers web site to download the drivers, install them, and walla, you are in business again.

Please rate this advice.

You can't. The partition was created by SONY to hold recovery files because so many people lose their installation disks. So SONY created the partition, loaded the special software on it and put options in the menu to use it.