often come with a Recovery Partition. Without a model and make we can't say, but since you are there you can look at the system and any manual/paperwork there is for guidance how to do this.
You say there is not a lot on the system so a recovery might be the best bet, but that would return the system to factory install, and delete everything.
Hello, i am trying to fix a friends laptop ,it is a windows 7 32 bit system, it had over 70 viruses which have now been cleaned, problem is clicking on any icon or program to start it results in an "open with" box opening up, i constantly have to open programs with right click and "run as administrator" every time ! also cannot open task manager, regedit etc any .exe file i get application not found, when i went into system32 to see if the files were there i cant find them , seems a lot of her .exe files have gone and no she has not backed up the laptop when she first bought it so there is no way to recover back to begining, shes only had it a couple of month so its not got lot on for her to lose butas she has not made a recovery back up i dont know what to do now, any help much appreciated