T61 Windows 7 hiding half my hdd space

Hi I hope someone can give me some advice.  I have a t61 6459 CTO which originally had vista premium OS.
I loaded windows 7 on the main partition quite a while back and it's working fine but for some reason my hdd shows that there is only 45 gigs free from 86 gigs.  I've deleted everything...the windows fole\der is 8.5 gigs, SWTOOLS is another 2 gigs but I can't see what is taking up the other Approximate 30 gigs.  I've turned on the "show hidden folders and nothing big is iding there.  Am I missing something???
When I go to Computer Management and then Disk Management I can see the 86 gig partition and I can see the recovery partition which is 6.8 gig.   This leads to my next request for help.  Of course thinking if I just  restore to factory condition my hdd space might come back but of course?@#$%! installing Windows 7 RC for some reason destroys my abilitie to use my recovery partition.....huh?  Was that necesary??? 
So a while back soon after I started this escapade with Microsoft, I tried to search here to find out how to get my vista back by somehow getting this machine to boot from that partition but I could only find bits of info suggesting there was some kind of app somewhere online that would fix the boot thing.  I tried to find it but had a hard time.   Today I'm back here searching again but not finding anything really to help me. 
Can anyone tell me how or where to find the info I need to get my t61 to recover to the original operating system which is on my 6 gig partition.  And can anyone tell me where my missing hdd space is?
This machine is updated with all the lenovo updates very recently.
Thank you for any help!!!!

Cravingmore wrote:
Can anyone tell me how or where to find the info I need to get my t61 to recover to the original operating system which is on my 6 gig partition.  And can anyone tell me where my missing hdd space is?
Thank you for any help!!!!
Hi Cravingmore,
Welcome to the forum!
You need this:- http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-54483 [It require floppy disk drive though]
Otherwise you would recovery discs to be able to go back to factory installed settings.
Hope it helps.
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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