Time to renew antivirus

My McAfee antivirus program is expiring early next month and I know I need to renew my subscription or buy a new one, but my McAfee system for some reason keeps getting disabled each morning time I start my computer. Not sure if there is a bug or just McAfee's irritating way of sending reminders....renew your subscription or else!!! I have already decided to go with them for another year, and just need to figure out where I order or renew my subscription, since I bought it in Singaporean $ and the renewal is showing up in GBP. I sent them a query and they replied sending me the local email and telephone number to contact (which does not work), so lets see what happens. Might just have to switch to a different company after all.