|That's not an unusual size for a page file.|
Mine is presently 4.84 gb, similar to the size of yours.
(4,190,208 KB = 4 gb)
(I have 3 gb of ram installed, and I am NOT using onboard video.)
The page (a.k.a. swap) file is essential for running Windows.
It's used for swapping Windows data between the ram and the hard drive.
If you manage to delete it a new one will be made automatically
Windows, when set to default settings, varies the size of the page file automatically depending on what the computer is doing at the time.
The contents of the page file are frequently changing.
See this Topic about getting rid of things that are un-necessarily taking up space, or that can be changed from default settings to take up less space:
Sometimes the C:\Windows\Installer folder becomes MUCH larger than it should be.
Do you have Windows set to show hidden files and folders ?
If you're not sure, go to Control Panel - Classic view - Folder Options, click on the View tab.
If there is no dot in the circle before Show hidden files and folders, click on the blank circle before that to place a dot there.
In this case, you may need to also have this setting.
If there is a check mark in the square box before Hide protected operating system files, click on the square box to remove the check mark.
If you changed any setting there, click on OK at the bottom of the Folder Options window.
Go to C:\Windows\Installer
Click on the Installer folder to highlight it and hold your mouse cursor over the Installer folder.
If doing that shows your Installer folder is really huge - e.g. mine is presently 2.69 gb - if it's a LOT larger than that.....
See response 4: