We can help you Clean Reinstall - Factory OEM Windows 7
but there can be problems with Samsung laptops getting the factory software to work correctly after reinstall.
For this reason make your Recovery disks first or save a Windows 7 backup image of the entire HD.
Users determined to obtain and maintain a Clean Reinstall may already know you don't want to retain the OEM partitions. Or you can save Recovery partition and if it won't boot afterwards then you can delete and reclaim it's space. The other OEM tools partition isn't needed after Clean Reinstall. As long as you make your Recovery disks or save an image then you have a path back to the bloated Factory pre-install.
If you used Anytime Upgrade to Pro then you'll need to reinstall the licensed OS on the COA sticker then Anytime Upgrade again afterwards to Pro. If you have a full, upgrade, or retail OEM Product Key then you can directly install it from it's latest official ISO download link in tutorial.
You can also attempt to repair the current installation, even Clean Up Factory Bloatware
which may help mitigate the corrupting bloatware.
Finally you can shrink C and do a booted test Clean Reinstall in the space you created to see how it works out and performs, then once you're certain we can help you delete it or remove the old installation and partitions if you want.