SCCM Windows Updates - Client stuck on Downloading but never finishes

Question

I am running SCCM 2007 with 200 clients.  I have been sucessfully performing windows updates through SCCM without an issue for about 6 months.  Recently I approved updates released in March and most of the updates installed ok, but there are two, KB938464 and KB958690, which sit on status Downloading for hours until the desktop is switched off at night.  The times reach 14 hours on some machines.
I have tried to cancel the updates by removing them from the Advertisements and from the Deployment packages but they still try to run everyday on 167 of 200 desktops.  If I manually go to Windows Update and install the updates the issue goes away, however, you can imagine my unwillingness to do this across 167 stations if I can avoid it. 
How can I do one or both of the following:
A) Cancel the updates so they no longer want to run on the clients
B) Fix the issue so the updates download properly.
The process that I use to approve and deploy updates:
Under Site Database -> Computer Management -> Software Updates
I select the updates I want to deploy and add them to a new update list.  I place a check into the box to download the files associated to the updates.
Once the update list is built I select to deploy the updates, give it a name that represents the update period
I select a template that deploys but suppresses restart in the updates.
I select a deployment package, the same one I used for all my past updates
Download from the Internet
English
Schedule
Finish.
This has worked sucessfully for months.
Thank you for any help that can be offered. 

Answer 1

I think you can use powershell command to modify the cache size
Here is the link: http://thephuck.com/scripts/use-powershell-to-change-sccm-cache-directory-cache-size/
$ColQuery = "select * from sms_cm_res_coll_SMS0005E"
$CollectionMembers = gwmi -computername SCCM_Server -namespace root\sms\site_SMS -Query $ColQuery |sort Name
foreach($comp in $collectionmembers){
$server = $comp.name
write-host -fore green `n`t "working on " $server
$ccmcfg = gwmi -computer $server -Namespace root\ccm\SoftMgmtAgent -Class CacheConfig
$ccmcfg.Location = "d:\path\to\cache"
$ccmcfg.Size = "2048"
$ccmcfg.Put()
#stop service, sleep for 10s, start the service
Get-Service -computer $server ccmexec | Stop-Service
Start-Sleep 10
Get-Service -computer $server ccmexec | Start-Service
write-host -fore green `n`t "finished" $server