What is the problem with my hard disk partitions?

There is no problem with anything. At least I don't see anything unless you are not using another OS (like Linux/BSD-derivative etc.) whose file system is not recognized by Windows.

Well, of course I was using linux mint. But it is not there now. And what about the unallocated and free spaces? Can I format them to create new partitions? Isn't there a danger of losing data, which I cannot afford to?Does it mean that the capacities of my hard drives have increased?

Yes, you can format them and create partitions. But do take a backup of your most important data on the other logical partitions, to be safe in any case.

If u r not using the linux partition and don't give a damn to the data stored in Linux partition, then u can use the space blocked by Linux in windows.
This is how u do it....(Only for Xp, don't know if it'll work in Vista)

1>Right Click on "MyComputer"
2>Select Manage
3>Form there go to Storage>Disk Management
Here u'll see windows is showing the linux partition as RAW/UNPARTITIONED (most probably)
4>Right click on the partition and select Format
5>Format as NTFS and give a Drive letter etc...rest u know wat to do.

^^^ The partitions are already visible. He just needs to format them

Office mein images nahi a rahe hai..........
answered only on basis of his query.

Thanks guys, I don't know what the problem was, but my friend suggested acronis disk director which solved it.

voila

those r very few partitions indeed!!!

^^

few ?? i say those are phew...... SOME partitions..

<Sarcasm>