800xA 4.1 can we make compatibility with windows 7/8
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As Wyvan says .... No.
Dont even bother trying it. The software wont run.
Since getting any hardware that will even run XP these day is pretty much impossible, you may want to consider moving everying accross to VM ware virtual machines. Again VMware isnt "officially" supported by ABB on version 4.1 but it does work, and can help extend the lifetime of your 4.1 system
However, its not a real solution. Widows XP has an increasing number of known serious security vulnerabilities that could be disasterous for your plant. You should migrate ASAP.