Yep - you can delete both the copy and the zip - Windows looks after the originals, which is why you have to make copies
I'm not sure where to find the cab file myself - try using this command in a Command Prompt window...
DIR C:\Windows\CheckSURlog.cab /S
It will take some time to run so be be patient! When the cursor comes back, post the output, and it'll tell us where it is (hopefully!) Here are some instructions to make life easier 1) To open an Elevated Command Prompt Window (the ECP window), click on Start, All Programs, Accessories – then right-click on Command Prompt, and select Run as Administrator. Accept the UAC prompt. 2) To run the commands easier, highlight the block of commands, and right-click on the highlight – select Copy. In the CP Window, click on the black/white icon at top left – select Paste. The commands will run but may not complete the last command, so hit the Enter Key once. 3) To copy the results... click on the Black/White icon in the top left, and select Edit... 'Select All', and hit the Enter key - then use Ctrl+V or r-click+Paste to paste it into your response.