Hoe do I get rid of a restriction on my PC that will not allow AVG Antivirus to run?

When I try to run a scan with Antivirus FREE on a Win XP PC, I get a "restrictions" pop-up that reads "This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator". The person who originally set up this machine is not available. How do I get rid of this restriction so AVG will run properly?

Steve, Previous posting you obviously won't need the Sales Support section & it's not the weekend.
AVG Guru

Steve, Have a look @ this new form link (http://support.avg.com/support_contact_form) to get chat/phone support. There's a Sales Support section. Otherwise, When available, A member of the official AVG Community Support in Brno, Czech Rep… (Working Hours [Mon-Fri] 9:00am - 5:00pm CET) will see your topic & respond but obviously bear in mind that it's now the weekend.
AVG Guru

Here are two Microsoft links discussing software restriction policy on Windows XP:
http://support.microsoft.com/kb/310791
http://technet.microsoft.com/en-us/library/bb457006.aspx
AVG Swami

Steve, Previous posting you obviously won't need the Sales Support section & it's not the weekend.
AVG Guru