There's simply no way for me to know what might happen down the line. I've given you my advice and some reassurance that your system should be ok.
All of the requirements of Windows is on the one partition (System, Boot, Page, Swap, Recovery, WinDir, PgmFiles, UserFiles, etc).
I would do a Clean install if it were my machine, but I don't think it is required.
I based my suggestions solely on these two posts of yours:
Ok, so I didn't insert a key, but according to the system page in the control panel "Windows is activated" but it's not a standard key, but some "product id" ?
Second, and a new issue - if someone can help me out, when installing windows, for some reason the first attempt screwed up, I forget what the error was, but it cancelled.
I now have a partition to the left of my primary one, and I can't extend the primary... how do I get rid of this?
If I make the unallocated space (501mb) a volume, I can shrink it, but only by ~ 280 mb. Presumably I could add that to my main.... is there some way to get rid of the whole thing?
I can start over and reinstall windows again...
It sounds to me as though you mistook the System Reserve partition (based on the 500 MB size) as unallocated and deleted it. The issue is that the SysRes part was deleted, but Windows repaired itself and should be fine.
It is your choice to leave it as is or do a Clean install.
I can't offer anything more other than if issues do crop up ... TenForum members will surely help resolve them.