How can I change the Registry size if I need to, for installation of another program

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 The Registry contains information about which devices are attached to the computer and which drivers should be used with them. It also keeps track of file associations (which programs should be used to open which type of files) and user preferences, such as what the monitor resolution and Desktop pattern should be. The Registry is contained in the System data and User.data files. Changes to the Registry are generally made through the Control Panel, not by users directly editing the Registry. Chances are you won't have to worry about changing the size of your Windows Registry (a database that contains information about user preferences and system configuration). But if you add a lot of software to your WinNT machine, you may need to increase size of your Windows Registry to accommodate all the Registry keys (entries containing the values that define each setting) for your programs. Usually, the Registry is relatively small, about 10MB to 12MB. If there's not enough room in the Registry to store new Registry keys, you'll get an error message.
 
 To increase the maximum size of your Registry when using WinNT, open the System Properties dialog box in the Control Panel (click Start, Settings, and Control Panel, then double-click the System icon). Click the Performance tab, then click the Change button in the Virtual Memory section. The Maximum Registry Size (MB) field is at the very bottom of the dialog box. You shouldn't have to increase it too much to make enough room for new Registry entries. Add about 5MB to 10MB to the current setting and enter the new number in the Maximum Registry Size (MB) field. Click OK and restart your system when Windows prompts you to do so. If you are using WinXP, open the System Properties dialog box in the Control Panel (click Start, Settings, and Control Panel, then double-click the System icon). Click the Advanced tab, then click the Settings button under Performance. In the Performance Options area, click the Advanced tab then click the Change button in the Virtual Memory section. The Maximum Registry Size (MB) field is at the very bottom of the dialog box.