HKLM\System\CurrentControlSet\Control|RegistrySizeLimit

Its a DWORD entry in BYTES

RegistrySizeLimit REG_DWORD 0x0 | 0x00040000–0xFFFFFFFE | 0xFFFFFFFF bytes

Default: 0x0

Establishes the maximum amount of memory and disk space that can be consumed by the Registry. You can add this value entry to the Registry to override the system's calculation of an optimal Registry size limit. RegistrySizeLimit only establishes a maximum size for the Registry. Unlike other limits, it does not allocate or reserve space for the Registry.
Registry size is limited to prevent the Registry from consuming space needed by processes. The value of RegistrySizeLimit applies to space in the paged pool, to disk space for the paging file and files where Registry data is stored, and to space used by some of the Registry's run-time structures. Other Registry run-time structures are governed by their own size limits or by other means.

If the value of this entry is 0x0, or if this value entry does not appear in the Registry, the system adjusts the value of RegistrySizeLimit dynamically based upon the size of the paged pool. This results in an optimal setting for most computers.
If the values of both RegistrySizeLimit and PagedPoolSize are 0x0, the system calculates an optimal value for both entries. Typically, the system sets the value of PagedPoolSize approximately equal to the amount of physical memory on the computer, and sets the vaue of RegistrySizeLimit to approximately 25 percent of the value of PagedPoolSize.

If the value of ths entry is greater than 0x0 and less than 0xFFFFFFFF, the value will be used as the Registry size limit. The system will not calculate an optimal size limit or adjust the size limit when the amount of memory or the size of the paged pool changes.
If the value of this entry is 0xFFFFFFFF, the system sets the the value of RegistrySizeLimit equal to 80 percent of the size of the paged pool.

Notes

Windows NT does not add this value to the Registry. You can add it by editing the Registry or by using a program that edits the Registry.
You must restart the system before a change to this value takes effect.
To ensure that a user can always start the system and edit the Registry, the size of the Registry is not subject to the maximum set in RegistrySizeLimit until after the first successful loading of a user profile.

Tip

To add or change this value, in Control Panel double-click System. Click the Performance tab, click Change in the Virtual Memory box, and then enter a value in the Maximum Registry Size box.

Technical Reference to the Windows NT Registry © Microsoft Corporation 1985 - 1997

Hope this helps

[ 04 September 2001: Message edited by: DGrayOne ]