Chinese technology experts on Monday warned computer users to be alert against Valentine themed computer viruses.

China National Computer Virus Emergency Response Center issued a circular warning computer users not to open spam with Valentine messages in the title line as it may contain worms like "Worm_Blebla.B," "VBS_ILoveyou" and "Vbs_Valentin.A."

The center warned Internet shoppers to be careful when ordering Valentine's Day items as some pop-ups may be bogus and cause computer problems.

It also alerted users that computer worms were being spread through Internet forums and online chatting tools such as QQ.