In hyaline arteriolosclerosis the condition affects small arteries and arterioles (the smaller branches of arteries) in people with diabetes. The artery walls thicken, narrow and weaken, leading to blocked blood flow. What percent of cases, if any, are caused by chronic virus infection?

This again is 100% virus caused, as is true for diabetes to begin with. So this is a potentially body-wide further manifestation of that viral incursion, and again, the local presentation of pathology is determined by a variety of factors including the particular viral strain.