Another factor to look for is how long it took to make rug. This can help determine value when comparing similar rugs. It is not unusual for a hand woven rug to take many months to many years to create. A typically sized rug can taken between 6-12 months to complete.

How old a Persian rug is important as well. An older carpet is generally more expensive. Be careful of dealers who chemically wash Persian rug to give it that aged look.

Learn about different styles. Various terms you will hear are Tribal styles and City styles. Selecting among two is more a matter of personal preference. Within each style, there are many popular and well known variations. Gabbeh, Shiraz and Bakhtiari are popular Tribal styles. Isfahan, Tabriz and Qum are popular City styles. There is a story behind each rug.

This is just starting point. Use internet or your local library to learn more.

We all have been told not to be too credulous; still lots of us fall for advertising bait. You must have already heard or read tips like these, but maybe they are worth reading once more:

Tip 1 If a company is unscrupulous in choosing means of advertising: tone of its ads is aggressive, they are scaring a potential customer and demanding immediate action (scan and system, install/buy/download some program NOW or something nasty will happen), if a company is using pop-ups and especially spam to distribute its "message"-- you'd better stay clear

Tip 2 If a company is very young and yet claims to offer something really wide-range and universal, or better to say, panacea-like, solution, with 100% guarantee--it's most likely a lie. No product is capable of protecting your PC against all malware. Only irresponsible vendors give such false promises, and only naive users believe them.

Tip 3 However name product bear, name is not product itself. Cool names don't describe functions, quality, or reliability of program, though imply them (usually it's not true). Words "perfect" or "advanced" in product's name may sound good, but don't at all mean this product works well or is better compared with others.

The conclusions are rather simple. Don't believe everything ads say. Do spend time on background checks before downloading, and you won't have to waste plenty of time, money and nerves afterwards.