Ques: Babaji ko pranaam!!
I want to buy a new laptop, 25000Rs. max...any brand..advice me
If you want reliability go for Lenovo. other good options will be Samsung/ASUS. Please avoid Dell, Acer or HP/compaq because a higher failure rate of these laptops was found in various onsumer surveys...
If you can expand your budget to 30K you can nuy a Lenovo Thinkpad which is virtually an indestructible laptop. These rugged machines last very very long. My first choice on this matter would be a Lenovo and second choice would be Samsung/ASUS. Go with Dell only if you can afford its complete cover warranty plan which costs 11 grands for 2 years extended warranty.
Check out these two laptops
For better bang for the buck : Samsung