C drive maxed out after vista reload

[Big Al1]

I recently had to reload vista the old os would no longer boot (malware?) After the reload everything looked good,fast again, until I started downloading stuff. A baloon opened and said I have low disk space. I opened c drive and it showed only the few things I had downloaded since reloading vista. How do I see what else is there (10 gb) and delete.
I'm a newbe and pretty much computer illiterate please be gentile.

 

[Rich-M]

Do you remember formatting and partitioning to reload? As for seeing what else there is open "Computer" and run cursor across drive C and look down to the left and you will see size of drive and how much is free.

 

[Big Al1]

I did click on a format button at reload. Now when I open C it only displays my new stuff which is only a few mb. The rest of the 10gb is not displayed. I assume it's my old vista OS and programs which I would delete

 

[Rich-M]

Something is wrong here as Vista alone can be 18 gb. What size drive and what is showing "not used"

 

[Big Al1]

I have a total of 120 gb. 60 gb open in D. C is full. I need to make room in C. What do I do? Should I try to load vista again and make sure I format before install.

 

[Rich-M]

Right click "Computer" choose "Manage", then "Disk Management". Right click D and choose "Expand Volume". The other choice would be to delete D, then expand C.
I know that Disk management in Vista can do it, I just have never done it. If you had 3rd party software like Acronis Disk Director the approach would be much more straight forward.

 

[Big Al1]

No luck, when that window opens EXTEND volume... is greyed out for both C and D drives.

 

[Rich-M]

You have to delete the D partition for it to work. It can only work with unallocated space.