How would you do this back up?
You can't separate your own software installations from the OS system files as there is no way to identify all the files concerned, so your chosen method of backing up is going to be relevant here.
If you open Computer, (either from the Start menu or from the shortcut icon on your Desktop if you have one there), you will see how much space is taken up by Windows 7 on the C drive. Pre-installed games are unlikely to take up a lot of drive space and bookmarks certainly will not, they are just small files in the Kb range.
Some of the data may be your personal files and data, like documents, photos, music and videos, so you can back up those separately and count how much hard drive space they have taken, and then the rest is the OS and software. Will that fit on to the 32 GB memory stick, (flash drive)?
Even if it does, what then? How will you reinstall Windows from that?
An example, I recently took a whole image backup of my Win 7 system using the backup utility I got from the drive maker's web site, a version of Acronis TrueImage, and it is 25 GB or so. It is stored on another hard drive, but it would easily have fit onto a memory stick. However, I am not sure a memory stick is a suitable storage medium for reinstalling Windows 7 if I ever have to. It may work OK, but I am guessing that transfer speeds may be slower than from a spare hard drive.
Windows' own backup and restore functions are not considered the best.
Running Windows 7x64 and IE 9, would a 32GB flash-drive be large enough to create a backup for the windows files alone. All the other files, on my C drive .are software downloads from CNET or some purchased.(Security Suite and some PRO additions of your downloads) They can be reinstalled and am looking to create a back-up only for the operating syatem, without al the JUNK ie games, bookmarks Games are both Microsoft and Toshiba and all the, unnessessary stuff that came with PC, but I don't use.