Hi Alex. Its good to see that more and more newbies want to learn how to use linux. I too was once like you, not too long ago. Here is a simple set of instructions that will help u to use fdisk and get you started on installation.
Things that you need:
1. MS-DOS bootable floppy(I recommend using WinME's startup disk since it definitely has all the utilities that you will require)
2. WinXP CD
3. Linux CD
before we begin with actual installation you should put your Linux CD 1 in the CD drive and boot from it to check whether the installation starts. If not then you will have to create a installation disk.
1. Shut down ur comp and put the MSDOS disk in the drive and start it up again.
2. After the C prompt appears run FDISK and select large disk support(just press Y).
3. A screen containing various tasks will be displayed similar to this one.
Microsoft Windows Millennium
Fixed Disk Setup Program
(C)Copyright Microsoft Corp. 1983 - 2000
FDISK Options
Current fixed disk drive: 1
Choose one of the following:
1. Create DOS partition or Logical DOS Drive
2. Set active partition
3. Delete partition or Logical DOS Drive
4. Display partition information
5. Change current fixed disk drive
Enter choice: [1]
4. Select 4th option. The partitioning info will be displayed. note down the partitions and their types.
5. Press 'escape' to return to the original screen and select 3rd option. You will a screen like this
Delete DOS Partition or Logical DOS Drive
Current fixed disk drive: 1
Choose one of the following:
1. Delete Primary DOS Partition
2. Delete Extended DOS Partition
3. Delete Logical DOS Drive(s) in the Extended DOS Partition
4. Delete Non-DOS Partition
Enter choice: [ ]
6. Delete all the partitions from the drive. While deleting go in the reverse order like if you have 4 partitions C,D,E,F. Then delete F,E,D,C.
7. After deleting all the partitions. Create new ones(Select 1 from the main menu). Like this:
Create DOS Partition or Logical DOS Drive
Current fixed disk drive: 1
Choose one of the following:
1. Create Primary DOS Partition
2. Create Extended DOS Partition
3. Create Logical DOS Drive(s) in the Extended DOS Partition
Enter choice: [1]
8. For what you are doing you will require 1 primary and 1 Extended DOS partition. So just go ahead and create those partitions.
9. Now you need to set the active partition(Active partition is the partition where your main OS resides, i think). So select the PRIMARY DOS PARTITION as your active partition.
10. Now, all you need to do is exit out of FDISK and format your drive by giving "format c:" command(without "

. This needs to be done from A: . Remember to format all the drives. You will not be able to use any partition without formatting it.
Installing XP:
1. Boot from the CD if it supports that. Or boot from the bootable disk provided with XP. Insert the XP CD and type Setup.
2.Choose Automated setup if you are unsure of providing all the info. But remember - when the setup asks you which File System you want, select Fat32 and NOT NTFS! and set the installation path to C:\windows.
3. After XP installation completes.
Installing LINUX:
1. Boot Linux Installation from CD 1. You can do this by setting the CD-Rom letter as the first in the boot up sequence.
2. The linux installation will begin. It will gather general info like the type of installation and such things. Answer them.
3. When it asks about partitioning. Select Manual and not auto. Now it will display a screen containing all the partitions. It will contain Hda1, Hda5... If you have another physical HDD then it will display Hdb1...etc. Simply select the second partition of the first drive i.e. Hda5.(Hda1 is the WinXP partition! dont touch it!)
4. Select 'add'. It will ask for the type of File System(Choose ext3), The mount point(choose / i.e. root) and the size(What ever size you want. But remember to leave atleast 64 to 128Mb free. This you will need for the swap partition.
5. Again select 'add'. Now choose the mount point as SWAP. And input the size 64/128 what ever you have selected.
5. Linux will then format your HDD(Only the selected partition) and start installation.
Wow! That was a big reply!!!
I may have missed out some finer points but I think this will get you through your dilemma.
If you arent able to boot from Linux CD1 then plz reply and I will tell you how to do it.
Bye,
Basix