I'm about to download, install, and setup the new wallet but would like to be sure of where I'm at first...

I had some amount of IOTA (say, 1000) for a long period of time.  Sitting synced in my wallet.  Within the last week, I've obtained and sent additional IOTA (say, 500) to my wallet.  Those IOTA appeared and I've had the wallet open and displaying that total balance ever since then.

My PC (Windows 10) just rebooted for some automatic updates. When I opened my IOTA wallet, I'm now seeing the original transaction amount and not the full amount that I expect to see.

It was originally showing 0 until I used the Attach To Tangle option.  Then the original (say, 1000) balance came in.  But the rest has not come back in yet. 

I would obviously like for it to appear again at some point, but I don't know if that's a misguided expectation. Is there anything that I need to do in order to rectify the situation?  Is it as simple as waiting it out or are there steps that I should be taking?