Windows XP is a specific, niche or boutique strain, described as a cross between Purple Urkel and Candy FumeZ. It is not a widely recognized, mainstream strain, and no further details regarding its effects, THC percentage, or terpene profile are widely available in major cannabis databases. 
Genetics: Purple Urkel x Candy FumeZ
Indica Hybrid
As it is a hybrid, it would typically be expected to offer a mix of effects, with Purple Urkel providing sedative, indica-leaning characteristics and Candy FumeZ likely bringing in flavorful, hybrid notes. Always check with a local dispensary for specific batch information.