Optimise Boot Files

Can reduce boot time to an extent because of defragmenting them at start up

Go to

HKEY_LOCAL_MACHINE\Software\Microsoft\Dfrg\BootOptimizefunction

Set the value of enable int this key to Y .
Reboot.

For application Stability

Can make each application more stable by launching in a separate process thread and also increases the load time

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PriorityControl

Set the DWORD value for Win32PrioritySeperation to anything in 27,28,37,38.You can experiment with other values.
After doing this go to tools->view menu in the explorer and check 'launch folder window in a separate process'.
Reboot.

Values Used In The Registry

* DWORD :- It is used to choose between multiple options where the entries are Boolean each
choice you choose causes your system to behave differently.

* String :- Used for Human readable text.

* Binary :- It is the data entered in Hexadecimal format useful for hardware and device settings.

Do You Know About The Structure Of Registry?

It has a structure similar to the structure of the windows explorer where we have drives there we can create folders and then sub-folders in the folders and sub-folders may even contain some files or any other data, Similarly in registry we have six Hives which may contain keys,sub-keys ... so on and which in turn may have some values.

For Processes Stability

Xp runs all the 16 bit applications in a single process, run in individual processes to increase stability.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WOW

Set the DefaultSeperateVDM string value to Yes.If its not there create it with the value Yes.