The Windows 95 Service Pack is a collection of essential upgrades for the original release of Windows 95. The Service Pack will upgrade your operating system from version 4.00.950 to 4.00.950a. Computers that have Windows 95 OSR2 (v4.00.950b) already installed should not be updated with this Service Pack as all of the functionality is already present in the OSR2 release. Users with international versions of Windows 95 should bypass this version for the language-specific Service Packs available from Microsoft's Web site.