Random BSOD after installing XP Udates

Could someone please help me I've had several BSOD since installing some XP critical updates. The mini dumps are attached.

Thanks John

Hi,

Most of your windows' crashes are caused by nt!HvpGetCellMapped . It may be related software hive corruption or faulty ram. Run memtest to stress test the ram and use regedit to repair the registry.

Try the following utility. Maybe it is useful to cleanup the registry
http://www.microsoft.com/downloads/details.aspx?FamilyID=1B286E6D-8912-4E18-B570-42470E2F3582&displaylang=en

Mini011506-02.dmp BugCheck 50, {d6acd318, 0, 8056e2f4, 0}
Probably caused by : ntoskrnl.exe ( nt!HvpGetCellMapped+d0 )

Hi,

Most of your windows' crashes are caused by nt!HvpGetCellMapped . It may be related software hive corruption or faulty ram. Run memtest to stress test the ram and use regedit to repair the registry.

Try the following utility. Maybe it is useful to cleanup the registry
http://www.microsoft.com/downloads/details.aspx?FamilyID=1B286E6D-8912-4E18-B570-42470E2F3582&displaylang=en

Mini011506-02.dmp BugCheck 50, {d6acd318, 0, 8056e2f4, 0}
Probably caused by : ntoskrnl.exe ( nt!HvpGetCellMapped+d0 )
Hi, thanks for your prompt reply and help. I've cleaned my registry and installed UPHClean. After reading the notes, which came with this program, it mentioned the error, Userenv/1517. I found this error in my Event Viewer and it has occurred nearly every day, for how long I don’t know. So I'll wait to see how things go in the next week.

Once again I'd like to thank you for taking the time to help me.

John :)