|Your copy of XP is not legal, as far as Microsoft is concerned, unless you have the official Microsoft sticker on the outside of the computer case that is for the same version as what was installed - Home, Pro, MCE 200x, or Pro 64 bit - and has the same type of license - OEM, Retail, or Volume, and your installation has not been " hacked" so that supplying a Product Key to Setup is not required. |
The following is ONLY about SP updates for Windows itself.
Whether what you installed did or did not come with Windows SPx updates doesn't matter, regarding that.
You NEVER delete anything that has an un-install program for it, which is usually listed in Add or Remove Programs in XP - that can cause you all sorts of problems.
Use the un-install program if there is one.
You can't un-install Windows SPx updates if they were integrated into Windows on the Windows version you intially installed.
You CAN un-install Windows SPx updates that you installed AFTER the Windows version you intially installed was installed, one at a time, the newest version first, if and only if it's listed, in Add or Remove Programs. (You can choose to NOT save the files, that are necessary to have to go back to so you can un-install the SPx updates, while installing them.)
Microsoft does not offer any NEW security or crtical updates for XP (the ones found via an Express search on the Microsoft Update or Windows Update web page on the Microsoft web site) , and Automatic Update won't install them either, unless the SP3 updates have bee installed. Some software requires that the SP3 updates have been installed.