Reset Provisioned Disk Size in VMWARE

I know: never touch anything you don't know anything about. But I did, and now I have a problem to solve.

I don't know anything about VMWARE. Someone installed VMWARE ESXI 4.01 on our server. We have two virtual machines.
I was looking around in the settings of one of the servers and increased the provisioning size of one the virtual hard disks from 99.9 GB to 150 GB. I clicked Ok. VMWARE accepted the change. We use thin provisioning.
So far, no problem. When I look  in de Windows SBS 2011 OS running in that machine nothing has changed. The size of the disk is still 99.9 GB, but our backup program (Arcserve D2D r15) doesn't wan't to start any backup jobs anymore. It stops the task saying 'Can't write to virtual disk. The system cannot find the file specified'.
HELP!!!
I suppose I can fix my problem by resetting the value of the provisioned size, but VmWare doesn't allow me to decrease the value. Or perhaps I need to something to make Windows aware of the changes. Or am I seeing this completely wrong???
NoraWilAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
So the size of the disk in the VM, is 99GB ONLY!

not the partition!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That is correct you can grow, but you cannot decrease.

If you check in Disk Management in the VM, does it show the increase disk size, but some space is unallocated?

otherwise, two options

1. Restore a Backup.
2. Use VMware Converter to complete a V2V to convert back to what it was 90GB.

Download VMware vCenter Converter here
http://downloads.vmware.com/d/info/datacenter_downloads/vmware_vcenter_converter_standalone/4_0
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NoraWilAuthor Commented:
Thanks for the reply.
I found a solution for the backup problem. A differential backup is not possible for the moment because the disk has changed. I started a full backup and this seems to work.
Is there still any need to run the VMware converter, because everything seems to work now?

I have indeed still unallocated disk space. For some strange reason the guy who installed the VMWARE used only 99GB of our 200 GB for the VMWARE + Windows OS.

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Unless you want to restore, what you have done, there is no need to use VMware Converter, other than you may have allocated an additional 50GB of disk space to the VM, you are not going to use.

What does Disk Management show in the VM?
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NoraWilAuthor Commented:
As I mentionned I know nothing of VMware (shame on me).
Where can i find Disk Management? On Google I found something about opening vmware-diskmanager on the host, but that doesn't seem to work.
In the settings of the datastore I find:
Capacity: 131,75 GB
Provisioned Space: 171,65 GB
Free Space: 51,09

Below Virtual Machins In Datastores I read
Provisioned space 171,09 of 1,57 TB
Used space: 80,11 GB of 431,87 GB

But I suppose you mean something else.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's nothing to do with VMware!

Log into the Virtual Machine, Right Click My Computer, Select Manage, Disk Management!
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NoraWilAuthor Commented:
Oh sorry, now I understand.
Then I have to refer to my answer to your first reply. Windows Disk Management shows only the 99 GB. The rest is not allocated yet. This afternoon  I created a new disk in VMWare. I gave it a size of 100 GB and then this showed up in Windows Disk Management. I deleted that disk again, but I suppose I can recreate it and extend the 99GB partition to make use of the complete 200 GB disk.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So the WIndows VM disk size is 150GB, with a 99GB partition, with 50GB approx unallocated?
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