I have a Compaq Presasio laptop-windows xp-dsl (not very computer savy)

Lately when I go to open some programs,etc. the little hour glass will stay on and then a message -program not responding- It don't happen each time I am on the computer but seems to be more frequent. It will happen when I am trying to open something on line or even if I open a document.

Then I can't get the darn thing to close down or go away. I click cancel or other places. Usually I can get the computer to restart then all is ok. Sometimes it takes a few tries to get it to restart.

I have defragmented-scanned-5 stage file check-Primary HDD self test.
I thought it helped then just now I tried to open a document in My briefcase and it acted up. Any help will be appreciated.

Should I take it to a shop for a $100 tune-up or what. Thankyou