DPM2007 - attach workgroup servers

I'm confused. Some websites say that you cannot attach a workgroup server to DPM 2007.

Other websites say that you can but you have to install the agent manually. Once instlled manually, you then need to run setdpmserver on the client and  attachproductionserver.ps1 on the dpm server.

So which is it?

If I try and manually and run the command setdpmserver on the workgroup machine, I get the error attached. I tried bothe full FQDN and IP

C:\Documents and Settings\Administrator>"C:\Program Files\Microsoft Data Protect
ion Manager\DPM\bin\SetDpmServer.exe" -dpmservername qst-bck01.headoffice.xxxx
.co.za
Configuring dpm server settings and firewall settings for dpm server =[qst-bck01
.headoffice.xxxx.co.za]
SetDpmServer failed with errorcode =80070005, error says: Access is denied.

C:\Documents and Settings\Administrator>"C:\Program Files\Microsoft Data Protect
ion Manager\DPM\bin\SetDpmServer.exe" -dpmservername 192.168.2.14
Configuring dpm server settings and firewall settings for dpm server =[192.168.2
.14]
SetDpmServer failed with errorcode =80070005, error says: Access is denied.

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