No, Windows 95 is not a virus. Here's what viruses do:

They replicate quickly.
    OK, Windows 95 does that.

Viruses use up valuable system resources, slowing down the system as they do so.
    OK, Windows 95 does that.

Viruses will, from time to time, trash your hard disk.
    OK, Windows 95 does that, too.

Viruses are usually carried, unknown to the user, along with valuable programs and systems.
    Sigh... Windows 95 does that, too.

Viruses will occasionally make users suspect their system is too slow (see above) and the user will buy new hardware.
    Yup, that's withWindows 95, too.

Until now it seems Windows 95 is a virus, but there are fundamental differences: Viruses are well supported by their authors, are running on most systems, their program code is fast, compact and efficient and they tend to become more sophisticated as they mature.

So Windows 95 is not a virus.