|memory is RAM|
you are talking disk space which is file storage.
Given your situation I would only recommend you do the following
1. uninstall programs not used anymore via add/remove programs in control panel
2. review your My Documents files and remove all no longer needed
3. run disk cleanup from the accessories/system tools menu with everything checked.
4. run disk defragmenter from the same menu.
any partition combining has its risks of data loss. You could not combine partitions anyway since you do not have enough free space to do so.
BTW only one post for one thread in one forum. Its a rule :-)
Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's